JP2005091225A - Electronic device and program having map display function - Google Patents

Abstract

In an electronic device having a map display function and capable of partially updating map data, it is possible to intuitively understand which part has been updated.
When map display is executed using updated map data (S30: YES), at least one display attribute of an updated part or a non-updated part is set according to the update history information read in S20. In other words, the map display is executed in a state where the two can be distinguished (S50). The display attribute can be changed by changing at least one of the attributes such as color, brightness, and line thickness. In this case, the updated part may be changed from the normal display attribute, or the non-updated part may be changed from the normal display attribute. Of course, both may be changed. Further, for example, the updated portion may be highlighted.
[Selection] Figure 3

Description

  The present invention relates to an electronic device having a map display function, such as a navigation device that displays a map on a display device based on map data.

  In a navigation device that displays a map on a display device based on map data, map data required for map display is read and acquired from a record data storage medium such as a CD-ROM or DVD-ROM. The map data in the CD-ROM etc. provided to such a navigation device is old as time passes due to various circumstances such as opening of new roads, changes in road shapes and traffic regulations, new establishments and closures of various facilities, etc. It becomes a thing. For this reason, CD-ROMs and the like are sold with their contents updated regularly (for example, every year). In addition, if the navigation device is of a type that uses map data stored in an updatable medium such as a hard disk or a flash memory, the data was updated by exchanging the medium itself or writing data at a store. .

  However, in the case of such a data update method, if the user (user) always tries to obtain the latest information, it must be purchased every time a new version of CD-ROM or the like is sold. For example, the data change not only for the necessary part but also for the whole country is forced, so the cost becomes high. In addition, since the amount of data increases, rewriting takes time if rewriting is performed on a hard disk or the like. Further, when the map data is updated using communication or the like, the data size is too large, and the current communication speed is not realistic in terms of communication time and communication cost.

On the other hand, a method of partially updating the map has been considered (for example, see Patent Document 1). In this method, for example, a part of new map data is sent to the navigation apparatus side by communication or the like, and the conventional data (old data) is rewritten on the apparatus (actual machine) side to update the data.
JP 2002-162233 A

According to the updating method disclosed in Patent Document 1, since only a necessary part can be updated by the user, the data size can be relatively small and the cost can be reduced, but there are the following problems.
In other words, when purchasing an old new version of CD-ROM, etc., the map data stored in it is created at the same time. It can have reliability (here, we focus on reliability from the viewpoint of new and old information). On the other hand, in the case of partial update, since old and new data are mixed, when a map is displayed, it is assumed that one part is the latest information but the other part is relatively old information. Is done. In such a situation, for example, the road is actually opened, and the map of the area is not updated even though the map corresponding to the new road is partially updated. In addition, a user who looks at the map may think that the road cannot pass through.
In actual operation, it is considered that the user will be responsible for the cost of partial map update. However, as a user, the price paid for the update is the part of the map update. If you don't know what it is for, you tend to be worried about whether it is really updated.

Such a problem is not limited to the navigation device, and similarly occurs in an electronic device having a map display function.
The present invention has been made in view of such problems, and in an electronic device having a map display function and capable of partially updating map data, it is intuitive to the user which part has been updated. The purpose is to make it understandable.

  An electronic apparatus having a map display function according to claim 1, which has been made to solve the above-described problem, is provided in a display device on the basis of map data read from a map data storage unit storing map data by a display control unit. Display the map to be displayed. The map data stored in the map data storage means can be updated by the update means. That is, it is information for updating the map data stored in the map data storage means, and includes at least information for specifying the update target in the map data and the update map data in association with each other. The update target portion of the map data is updated using the update information. If there is such an updated part, the display control means executes the following display control. In other words, if the display target map contains a part that has been updated with the update map data, at least either the updated part or the non-updated part so that the updated part can be distinguished from the non-updated part. The display state of either one is changed.

The update portion may be a predetermined range unit of the map, or a component unit such as a road, background, or character in the map. In addition, the display state can be changed by changing at least one of display attributes such as color, brightness, and line thickness. In addition, for example, the updated part may be displayed in a so-called highlight. In short, it is only necessary to change the display state of at least one of the update part and the non-update part so that the update part can be distinguished from the non-update part.
In this way, the user who sees the displayed map can intuitively understand which part is updated. Thus, for example, a road has actually been opened and the map corresponding to the new road has been partially updated, but the map of some areas has not been updated. If it appears that the road is not connected, only the map where the road is not connected is not updated, and if the other maps are updated, the user may be able to pass through the road. It can also be estimated. Such a determination is very difficult if the updated part and the non-updated part cannot be distinguished, but if they can be distinguished and visually recognized as in the present invention, an appropriate determination can be made. In addition, when costs are incurred for updating, it is intuitively known which part of the map the consideration paid for updating is for updating the map, and the user is relieved. Furthermore, if the user knows that there is a non-updated part in the area that he / she wants to update, he / she feels that he / she wants to update that part positively, and as a result, he / she has more up-to-date map data. It will be.

The update map data may be provided by communication from the information center, for example, or may be provided in the form of package software.
In the case of the electronic device according to claim 1, the map data itself stored in the map data storage means is updated. However, in the case of the electronic device having the map display function according to claim 2, The map data itself is not updated, update information is stored separately, and necessary portions are updated and used when displaying the map. In other words, in the electronic device according to claim 2, the update information storage means is information for updating the map data stored in the map data storage means, and specifies at least an update target in the map data. Information for update and map information for update are stored in association with each other. When displaying the map to be displayed, the map data of the corresponding area is read from the map data storage means to the temporary storage means, and the update map data belonging to the corresponding area is stored in the update information storage means The update map data is read out to the temporary storage means, the update target part of the map data is updated, and at least either the update part or the non-update part so that the update part can be distinguished from the non-update part The display state of either one is changed.
In this way, the user who sees the displayed map can intuitively understand which part is updated. Further, in the case of the present electronic device, the update of the map data is advantageous in the following points because only the range to be displayed on the map needs to be updated. That is, map data is generally used not only for map display but also for route calculation in a navigation device, for example. Therefore, network data is included, but as a characteristic of this network data, even when a part of it is updated, there is a possibility that a wide range of network data must be updated depending on the updating method. Of course, if updated in this way, the updated network data will be obtained no matter which area of map data is used after the update. However, the network data of the area not actually used for map display is also uniformly updated. Further, if partial update of map data frequently occurs, a wide range of network data must be updated each time. And since the update processing of a wide range of network data is heavy, there is a high possibility that a large processing load will be imposed while the update is substantially useless.

  On the other hand, if only the map of the display target part is updated and used at the time of use like this electronic device, even if it has a route calculation function in addition to the map display function, Therefore, it is only necessary to update only map data in a narrow range, which is preferable in terms of processing load reduction.

Even if the method of updating only the necessary part at the time of use is adopted in this way, the area for which the map data update process has been executed once is stored as the updated map data, and thereafter When the display of the same area is instructed in the map display process, the stored updated map data may be used. In this way, it is not necessary to execute the update process redundantly, which is advantageous in reducing the processing load. Further, it is possible to easily cope with the case where the map data is updated a plurality of times for the same area.
By the way, when the update time is a plurality of times, it can be considered as follows. In other words, the update time is included in the update information, and when the display control means has a plurality of update parts with different update times, the update part or the non-update part is distinguished so that the difference in the update time can be distinguished and visually recognized. The display state of at least one of the above is changed. It is also effective to change the display state of at least one of the updated part and the non-updated part so that the order of the update times can be distinguished and visually recognized. These can be realized, for example, by changing the displayed color, brightness, line thickness, and the like. In this way, the user can intuitively understand the so-called “freshness” of the map data. Furthermore, the information indicating the update time may be displayed so that the corresponding update part can be specified. For example, it is conceivable to display information such as “update year, month, month, day” in the update area, or display it as indicated by an arrow if it is a component such as a road.
Further, regarding the change in the display state, for example, the presence or absence of the change may be switched according to a user operation. That is, a receiving unit that receives an instruction as to whether or not to change the display state is provided, and the display control unit displays a map display that changes the display state or a map display that does not change the display state according to the instruction received by the receiving unit. Do it. This makes it easier to understand where the updated part is.
Note that a navigation device is considered as a representative example of such a geoelectronic device, but even a device other than the navigation device can be applied in the same manner as long as it is an electronic device having a map display function, and similar effects can be obtained. .

  Moreover, if the computer which the electronic device which has a map display function is made to run the program which concerns on Claim 9, the function as a display control means in the electronic device in any one of Claims 1-8 is implement | achieved. Can do. In the case of such a program, for example, the program is recorded on a computer-readable recording medium such as a flexible disk, a magneto-optical disk, a CD-ROM, a hard disk, a ROM, and a RAM, and is loaded into the computer and started as necessary. Can be used. It can also be used by loading and starting up via a network.

  Embodiments to which the present invention is applied will be described below with reference to the drawings. The embodiments of the present invention are not limited to the following examples, and can take various forms as long as they belong to the technical scope of the present invention.

[Description of Navigation Device 1]
FIG. 1 is a block diagram showing a schematic configuration of a navigation device 1 as an embodiment of a map data utilization device. The navigation device 1 includes a position detector 21 that detects the current position of the vehicle, an operation switch group 22 for inputting various instructions from a user, and a remote control terminal that can input various instructions in the same manner as the operation switch group 22. (Hereinafter referred to as a remote control) 23a, a remote control sensor 23b for inputting a signal from the remote control 23a, an external information input / output device 24, and map data and the like are input from an external recording medium on which various information is recorded. A map data input device 25, a display device 26 for performing various displays such as a map display screen and a TV screen, a voice output device 27 for outputting various guide voices, and the like, for storing various data. External memory 28, the above-described position detector 21, operation switch group 22, remote controller 23a, external information input / output device 24, map data Various processes are executed according to inputs from the force unit 25 and the external memory 28, and the position detector 21, operation switch group 22, remote control sensor 23b, external information input / output device 24, map data input device 25, display device 26, An audio output device 27 and a control circuit 29 for controlling the external memory 28 are provided.

  The position detector 21 receives a radio wave transmitted from an artificial satellite for GPS (Global Positioning System) via a GPS antenna and is added to the vehicle and a GPS receiver 21a that detects the position, direction, speed, and the like of the vehicle. A gyroscope 21b for detecting the magnitude of the rotational motion, a distance sensor 21c for detecting the distance traveled from the longitudinal acceleration of the vehicle, and the like, and a geomagnetic sensor 21d for detecting the traveling direction from the geomagnetism are provided. Yes. Each of the sensors 21a to 21d has an error having a different property, and is configured to be used while complementing each other. Depending on the accuracy, a part of the sensors described above may be used, or a steering rotation sensor, a wheel sensor of each rolling wheel, or the like may be used.

  As the operation switch group 22, a touch panel installed on the display screen, mechanical key switches provided around the display device 26, and the like are used. Note that the touch panel and the display device 26 are laminated and integrated, and there are various types of touch panels such as a pressure-sensitive method, an electromagnetic induction method, a capacitance method, or a combination of these methods. Also good.

  The external information input / output device 24 receives FM broadcast signals via a radio antenna (not shown), or receives radio waves from a fixed station for a VICS (Vehicle Information and Communication System) service arranged near the road. A beacon signal and an optical beacon signal are received. The received information is sent to the control circuit 29 for processing. Further, it is connected to a mobile phone (not shown), and has a function of acquiring information from an information center (not shown), or connecting to the Internet and acquiring information from a server on the Internet.

  The map data input device 25 includes various kinds of data including road data as network data, map data such as so-called map matching data for improving the accuracy of position identification, mark data indicating facilities, guidance images and audio data, and the like. A device for inputting data. As a recording medium for these data, a CD-ROM, DVD, hard disk, memory, memory card, or the like can be used.

  The display device 26 is a color display device, such as a liquid crystal display, a plasma display, or a CRT, any of which may be used. The display screen of the display device 26 includes a mark indicating the current location identified from the current position of the vehicle detected by the position detector 21 and the map data input from the map data input device 25, a guidance route to the destination, and a name. Additional data such as landmarks and various facility marks can be displayed in an overlapping manner. Also, facility guides can be displayed. The voice output device 27 can output facility guidance and various guidance voices input from the map data input device 25, and information reading voices obtained via the external information input / output device 24.

  The external memory 28 includes an update map data storage unit 28a for storing update map data and an update history storage unit 28b for storing update history information. The update history information refers to, for example, information such as ID, shape, and position for specifying the update map data, and various information related to the update such as the update date / time and update contents.

  The control circuit 29 is configured around a well-known microcomputer comprising a CPU, ROM, RAM 29a, I / O and a bus line connecting these components, and the position is determined based on a program stored in the ROM or the like. Based on each detection signal from the detector 21, the current position of the vehicle is calculated as a set of coordinates and traveling directions, the map near the current position read via the map data input device 25, the operation switch group 22, the remote controller 23a, etc. Based on the map display processing for displaying a map or the like in the range instructed by the operation on the display device 26 or the point data stored in the map data input device 25, the destination and the destination are determined according to the operation of the operation switch group 22 or the remote controller 23a. A route plan that guides the route by selecting a facility and calculating the route automatically from the current position to the destination Processing is carried out. A technique such as the Dijkstra method is known as a technique for automatically setting an optimum route in this way. In such map display, route calculation / guidance, and the like, update map data stored in the update map data storage unit 28a in the external memory 28 is also used in some cases. This point will be described in detail later.

  The schematic configuration of the navigation apparatus 1 has been described so far. The recording medium set in the map data input device 25 corresponds to the map data storage means, the control circuit 29 corresponds to the display control means, The RAM 29a corresponds to temporary storage means, and the external memory 28 corresponds to update information storage means.

[Explanation of map data]
Next, map data will be described. The map data input unit 25 inputs map data stored in a recording medium such as a CD-ROM. A map source data database (hereinafter referred to as a map), which is a source of map data stored in the CD-ROM or the like. The original DB is created by another map production company and received at the information center. Every time the map original DB is received at each year, the information center creates a CD-ROM for that year. To do. It should be noted that when the CD-ROM or the like of each year version is created, shape deformation or thinning of the shape point coordinate sequence is performed on the graphic data of the map original data. Then, the CD-ROM or the like created in this way is sold through a predetermined route and mounted on the navigation device 1. In addition, when the map source DB is received, the information center compares the latest year version map source DB with the previous year version map source DB, and the difference data between the new and old map source data (that is, additional data) (Or data that has been deleted or changed), and the map data for update (XX) for the navigation device 1 to upgrade the map data of the XX year version to the map data of the XY year version, for example, from the extracted difference data Year-XY year update map data) is created and stored in the update map data database (hereinafter referred to as update map DB).

  There are various possible units for extracting the difference data. For example, the map data itself is a small mesh unit based on a certain longitude width (for example, a primary mesh defined in JIS (Japanese Industrial Standard) or 2). If it is assumed that the next mesh unit is cut out and used, it may be extracted in units of the small area. That is, if there is any change in the small area, the entire small area is considered as difference data. Further, instead of such an area unit, only the actually updated data or only the “updated portion” may be considered as the difference data. In this way, it is advantageous in avoiding duplication of data without making a wide range of map data including a portion not actually updated as difference data. In the present embodiment, the description will be made on the assumption that only the part updated in this way is used as difference data. For example, even when only one road is newly established, only the road (link) does not become differential data. As the road is newly established, one link is divided into two links, or the link connection relationship is changed. Therefore, the predetermined range in consideration of the change is the difference data (update map data). ) This point will be specifically described later.

  In addition, the information center not only updates the map data for updating the map data on a year-by-year basis, but also updates the map data when, for example, a new road is established within the same year. Is also stored in the update map DB. Such road establishment information in the same fiscal year may be created by the above-described map production company, or may be obtained independently by the information center. With regard to the update map data within this fiscal year, for example, an update date is added, so that it is possible to determine the month and date of the update map data.

When the information center receives a request for update information from the navigation device 1, what version of the map data is currently held from the navigation device 1, and how many days and how many days of update map data are stored The user uploads information such as whether he / she holds the map, and selects and transmits update map data for updating the map data held by the navigation device 1 to the latest contents.
At this time, the information center side assumes that the oldest map is held without uploading the information of the held data from the navigation device 1, and a method of transmitting all the update information is also conceivable. In addition, assuming that the navigation device 1 has the newest map, the information center side only transmits the latest update information once, and determines whether the navigation device 1 side has excess or deficiency of data, and updates the data in the update process. If it is determined that there is an excess or deficiency, a method of repeatedly requesting the information center to transmit the update information (update information one step older) may be used.

  The navigation device 1 inputs the update map data transmitted from the information center in this way via the external information input / output device 24 and stores it in the update map data storage unit 28 a of the external memory 28.

  Here, the hierarchical structure of the map data will be described. As shown in FIG. 2, the map data 100 is generated and recorded for each level from level 5 to level 0 for each level of detail. Level 5 is the level in which the recording range of each area map data 50 is the widest on the map (that is, the values of x1 and y1 are the largest), and stores only terrain data. Level 4 has a wide recording range of each area map data 50 following level 5, and stores terrain data and highway road data. Level 3 has a recording area set for each area map data 50 in the width following Level 4, and stores road data for national roads in addition to topographic data and highway road data. Level 2 has a recording area set for each area map data 50 in the width following Level 3, and stores road data for prefectural roads in addition to topographic data and highway / national road data. Level 1 is the same as Level 2 in which the recording range of each area map data 50 is set. In addition to topographic data and expressway / national / prefectural road data, city road data is stored. ing. Level 0 is the same area as Level 1, and the coverage of each area map data 50 is set. In addition to topographic data and highway / national / prefectural / city road data, narrow street road data Is stored. That is, level 5 stores the widest range of data, and level 0 stores the most detailed data.

  The road data in this map data is a map constructed by connecting a plurality of nodes such as intersections with links. For each link, a unique number (link ID) for identifying the link and the link From the link length indicating the length, the x and y coordinates of the start and end of the link, the road width of the link, the road type (indicating road information such as toll roads), and road ID data for identifying the road Link information is provided. In the map data, place name information, traffic information, and facility information are stored together with their coordinates (x, y coordinates). The topographic data can be composed of image data, for example.

[Description of map data display processing]
As described above, the control circuit 29 uses the map data read out via the map data input device 25 and the update map data read out from the update map data storage unit 28a in the external memory 28 to display a map. Processes such as route calculation and guidance are executed. Here, the map display processing will be described with reference to the flowchart of FIG.

  First, map data of an area used for map display is read from the recording medium into the RAM 29a via the map data input device 25 (S10). Subsequently, the update map data and the update history information are read into the RAM 29a from the update map data storage unit 28a and the update history unit 28b in the external memory 28 (S20).

  Then, it is determined whether there is update map data belonging to the area of “Map data used for route calculation” read in S10 (S30), and if there is update map data belonging to the area (S30: YES). Using the update map data, update processing for the “map data used for map display” read in S10 is executed on the RAM 29a (S40). The update portion may be a predetermined range unit of the map, or a component unit such as a road, background, or character in the map. Although details of the map data update processing are omitted, for example, a method disclosed in Japanese Patent Application No. 2003-153106 by the applicant of the present application can be used. Further, this map data update is executed if there exists corresponding update map data at each level (level 5 to level 0) shown in FIG.

And after map data update processing is performed, map display is performed using the map data after the update. At this time, the display attribute of at least one of the updated part and the non-updated part is changed according to the update history information read in S20, and the map display is executed in a state where the two can be distinguished (S50).
The display attribute can be changed by changing at least one of the attributes such as color, brightness, and line thickness. In this case, the updated part may be changed from the normal display attribute, or the non-updated part may be changed from the normal display attribute. Of course, both may be changed. Further, for example, the updated portion may be displayed in a so-called highlight. In short, it is only necessary to change the display state of at least one of the update part and the non-update part so that the update part can be distinguished from the non-update part.
When the update time is a plurality of times, the display state is set such that the order of the update times can be distinguished based on the update date and time of the update history information. For example, if the brightness is changed, it can be considered that the newer the update time, the brighter the brightness. At that time, the non-updated part may be displayed with the same brightness as before, and the updated part may be made brighter as the update time is newer. Conversely, the brightness of the part with the newest update time is kept as before. Older ones may be darker, and the original map may be darker. In addition, if the color is changed, it can be considered that the newer the update time, the darker and clearer it becomes. In this case as well, as in the case of the brightness described above, the update part may be changed so that the color becomes darker than usual, and conversely, the color of the part with the newest update time is the same as before. If the update date is older, the color may be lighter than that, and the original map may be lighter.
For example, when considering a road, an update is not necessarily added but may be deleted. In that case, the presence of the deleted previous road is visible and displayed so that it can be visually recognized that the road does not actually exist. For example, a countermeasure is taken such that the line type is changed and a chain line (such as a two-dot chain line) is displayed.

  On the other hand, if there is no update map data belonging to the area (S30: NO), map display is executed using normal map data, that is, "map data used for map display" read in S10 (S60). ).

[Effect of this embodiment]
According to the navigation device 1 of the present embodiment, when displaying a map, since an update part and a non-update part can be distinguished and the order of update times can also be distinguished and displayed so that the user can see it, You can intuitively understand which part is updated. Therefore, for example, although the road is actually opened and the map corresponding to the new road has been partially updated, the map of some areas has not been updated. Even if it seems that the connection is not connected, it is possible to make an appropriate determination by comprehensively considering whether or not the surrounding map is updated.
In addition, when costs are incurred for updating, it is intuitively known which part of the map the consideration paid for updating is for updating the map, and the user is relieved. Furthermore, if the user knows that there is a non-updated part in the area that he / she wants to update, he / she feels that he / she wants to update that part positively, and as a result, he / she has more up-to-date map data. It will be.

[Other embodiments]
(A) In the above-described embodiment, the display state of at least one of the update part and the non-update part is changed so that the difference in the update time can be distinguished and visually recognized, and the order of the update time is also distinguished and visible. I changed it. In this way, the user can relatively understand the “freshness” of the map data, but if you want to know when it has been updated, you can do the following: That is, the information indicating the update time is displayed so that the corresponding update part can be specified. For example, it is conceivable to display information such as “update year, month, month, day” in the update area, or display it as indicated by an arrow if it is a component such as a road. In this case, since the visibility of the original map information may be lowered if it is always displayed, for example, the information indicating the update time is only displayed when the cursor or the like is moved to the update portion without being normally displayed. You may make it display.
(B) Regarding the change of the display state, the presence or absence of the change may be switched according to the user operation. For example, by operating the operation switch group 22 or the remote controller 23a (these correspond to the accepting means), it is possible to instruct whether to switch the display state. In this way, the display state can be switched between a state in which the display state is not changed and a state in which the display state is changed, and the user who sees the display state can more easily understand where the updated portion is.
Further, for example, even after the user understands where the updated portion is, there may be a user who does not want to display the constantly updated portion separately from the non-updated portion. Therefore, if the presence / absence of change can be switched as described above, it is possible to meet such a user's desire.

  (C) In the above embodiment, the map data is updated with respect to the old data every time the map display is executed. However, for example, updated map data obtained by updating the map data once may be stored in, for example, the external memory 28 and used for subsequent map data update. That is, for example, after the map data (old data) of the area used for route calculation is read into the RAM 29a and the updated map data belonging to the area is stored in the external memory 28, the stored updated data It is conceivable that the map data is read into the RAM 29a and used instead of the old data.

  In this way, it is not necessary to perform the update process repeatedly for the area where the map data update process has been executed once, which is advantageous in reducing the processing load. Further, it is possible to easily cope with a case where the map data is updated several times in the same area. For example, if there is “updated map data” after the map data is updated using the first update map data, the second update map data is used for the updated map data. What is necessary is just to perform the update process of the map data which were there.

  In addition, when updating information is acquired instead of updating only the necessary part of such map data, the map data is updated using all of the acquired update map data, and the updated map data is always stored. You may make it leave. In such a case, all map data read from a CD-ROM or the like via the map data input device 25 is stored in a large-capacity storage medium such as a hard disk, and the update map data is acquired. The map data in the hard disk itself is updated. In this way, since the map data that is in the latest updated state can always be used at the stage of subsequent use for map display, the map data update process at that time as in the above embodiment Is unnecessary.

  (D) In the above embodiment, the update map data is distributed from the information center. However, for example, the update map data is read from package software such as a CD-ROM and stored in the update map data storage unit 28a in the external memory 28. It may be.

It is a block diagram which shows the structure of the navigation apparatus of an Example. It is explanatory drawing of the level of map data. It is a flowchart for demonstrating a map display process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Navigation apparatus, 21 ... Position detector, 21a ... GPS receiver, 21b ... Gyroscope, 21c ... Distance sensor, 21d ... Geomagnetic sensor, 22 ... Operation switch group, 23a ... Remote control, 23b ... Remote control sensor, 24 ... External Information input / output unit 25 ... Map data input device 26 ... Display unit 27 ... Audio output unit 28 ... External memory 28a ... Map data storage unit for update 28b ... Update history storage unit 29 ... Control circuit 29a ... RAM, 50 ... area map data, 100 ... map data.

Claims (9)

Display control means for displaying a map to be displayed on the display device based on the map data read from the map data storage means storing the map data;
Information for updating the map data stored in the map data storage means, and includes at least information for specifying an update target in the map data and map data for update. Updating means for updating the update target portion of the map data using the update information being updated;
When the display control unit includes a portion updated by the update map data in the display target map, the updated portion is displayed so that the updated portion can be distinguished from the non-updated portion. Or changing the display state of at least one of the non-updated parts,
An electronic device having a map display function characterized by Display control means for displaying a map to be displayed on the display device based on the map data read from the map data storage means storing the map data;
Information for updating the map data stored in the map data storage means, and includes at least information for specifying an update target in the map data and map data for update. Update information storage means for storing the update information being stored,
Temporary storage means for temporarily storing map data for display;
When displaying the map to be displayed, the display control means reads the map data of the corresponding area from the map data storage means to the temporary storage means, and the update map data belonging to the area is the update information. If stored in the storage means, the corresponding update map data is read out to the temporary storage means to update the update target portion of the map data so that the update portion can be distinguished from the non-updated portion and visible. An electronic device having a map display function, wherein the display state of at least one of the updated portion and the non-updated portion is changed. The electronic device according to claim 1 or 2,
The update information includes an update time,
When there are a plurality of update parts having different update times, the display control means changes the display state of at least one of the update part and the non-update part so that the difference in update time can be distinguished and visually recognized. An electronic device having a map display function. The electronic device according to claim 3,
The electronic device having a map display function, wherein the display control means changes a display state of at least one of the updated part and the non-updated part so that the order of the update times can be distinguished and visually recognized. The electronic device according to claim 3 or 4,
The electronic device having a map display function, wherein the display control means further displays information indicating the update time so that a corresponding update portion can be specified. In the electronic device in any one of Claims 1-5,
The display control means changes a display state of at least one of the updated part and the non-updated part by changing at least one of display attributes such as color, brightness, and line thickness. Electronic equipment with a display function. In the electronic device in any one of Claims 1-6,
Furthermore, it comprises a receiving means for receiving an instruction as to whether or not to change the display state,
The electronic device having a map display function, wherein the display control unit executes a map display in which the display state is changed or a map display in which the display state is not changed in accordance with an instruction received by the receiving unit. In the electronic device in any one of Claims 1-7,
An electronic apparatus having a map display function, wherein the electronic apparatus is a navigation device. The program for making a computer implement | achieve the function as a display control means in the electronic device which has the map display function in any one of Claims 1-8.

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