JP2013242684A - Data distribution device, data distribution method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data distribution device, a data distribution method and a program which can reduce an amount of communication of update data to be transmitted to a communication terminal device in order to reduce communication charge.SOLUTION: A data distribution device comprises: data size acquisition means which acquires data size of difference data for updating data stored in a communication terminal device and data size of entire update data for collectively updating the data stored in the communication terminal device to new data; communication method acquisition means which acquires a communication method for communicating with the communication terminal device; and distribution means which distributes, to the communication terminal device, update data having the smaller data size between the data size of the difference data and the data size of the entire update data acquired by the data size acquisition means if communication charge of the communication method changes according to an amount of communication data.

Description

  The present invention relates to a data distribution apparatus, a data distribution method, and a program for distributing update data.

Conventionally, various techniques for distributing update data for updating data such as map information and programs have been proposed.
For example, in the navigation apparatus, a data acquisition request method is determined in advance for each map distribution target file type (difference update data and all update data). For example, the differential update data is acquired by a vehicle communication module or a mobile phone, and all the update data is acquired by connecting to a store HDD. Further, there is a map update system configured to set an update order according to a preset priority setting table when update data being acquired is duplicated or when update timing is duplicated ( For example, see Patent Document 1.)

  Further, for example, the negative distribution server obtains a difference between the latest total amount negative data and the past total amount negative data, and creates difference negative data. Then, the negative distribution server is one of the differential negative data and the total negative data based on the combination of the processing performance of the terminal that performs the check process using the total negative data, the load status of the network, the number of simultaneous accesses from the terminal, and the like. There is a negative delivery system that selects and delivers to a terminal (for example, see Patent Document 2).

JP 2008-58748 A JP 2009-187523 A

  However, in the map update system described in Patent Document 1 described above, in many cases, the data size of the differential update data is smaller than the data size of all the update data, but the data size of the differential update data is greater. It may be larger than the data size of all update data. For this reason, when a navigation apparatus acquires difference update data from a map distribution center using a vehicle communication module or a mobile phone, there is a possibility that a user is burdened with a useless communication fee. Moreover, in the negative delivery system described in Patent Document 2 described above, when the access from the terminal is concentrated, the negative delivery server increases the processing load for creating differential negative data for each terminal, and cannot be processed completely. There is a fear.

  Accordingly, the present invention has been made to solve the above-described problems, and data distribution that can reduce the communication charge by reducing the amount of update data transmitted to the communication terminal device. An object is to provide an apparatus, a data distribution method, and a program.

  In order to achieve the object, a data distribution apparatus according to claim 1 includes a center-side data storage unit that stores data for each version, and an update history storage unit that stores a final update version of data stored in the communication terminal device. Differential data extraction means for extracting differential data for updating data stored in the communication terminal device from version-by-version data stored in the center-side data storage means based on the last updated version; , All update data creating means for creating all update data for batch updating the data stored in the communication terminal device to new data, and obtaining the data size of the difference data and the data size of the all update data Data size acquisition means, communication method acquisition means for acquiring a communication method with the communication terminal device, and communication of the communication method Charge determination means for determining whether or not money changes depending on traffic, type setting means for setting the type of update data to be distributed to the communication terminal device, update data set by the type setting means A distribution unit that distributes one of the difference data and all the update data to the communication terminal device according to a type, and the type setting unit determines whether the communication fee of the communication method is communicated by the fee determination unit. If it is determined that the amount of data changes depending on the amount, the update data having a smaller data size out of the data size of the difference data and the data size of all the update data acquired via the data size acquisition unit is It is set as a type of update data to be distributed to the communication terminal device.

  A data distribution apparatus according to claim 2 is the data distribution apparatus according to claim 1, wherein when the charge determination unit determines that the communication fee of the communication method does not change depending on the communication amount, the current processing is performed. Processing load acquisition means for acquiring processing load information related to load; and threshold determination means for determining whether or not the current processing load is less than a predetermined load threshold based on the processing additional information, the type setting means When the threshold determination means determines that the current processing load is equal to or greater than a predetermined load threshold, the update data is set as a type of update data to be distributed to the communication terminal device. .

  The data distribution device according to claim 3 is the data distribution device according to claim 1, wherein the difference data is determined when the fee determination unit determines that the communication fee of the communication method does not change depending on the communication amount. And all the update data, the required time acquisition means for acquiring the update required time until the update is completed in each communication terminal device, and the type setting means, the difference data acquired by the required time acquisition means and the difference data The update data with the shorter update time out of the update time required for completion of update in each communication terminal device with all update data is set as the type of update data to be distributed to the communication terminal device. It is characterized by.

  According to a fourth aspect of the present invention, there is provided a data distribution method comprising: a control unit; a center side data storage unit that stores data for each version; and an update history storage unit that stores a final update version of data stored in the communication terminal device. And a data distribution method executed by a server including at least the difference data for updating data stored in the communication terminal device based on the final update version executed by the control unit Is extracted from the data for each version stored in the center-side data storage means, and all update data is created to update the data stored in the communication terminal device to new data collectively. All update data creation process, the data size of the difference data extracted in the difference data extraction process, and all the data created in the all update data creation process The data size acquisition step for acquiring the data size of the new data, the communication method acquisition step for acquiring the communication method with the communication terminal device, and the communication fee of the communication method acquired in the communication method acquisition step varies depending on the communication amount. The difference data according to a charge determination step for determining whether to perform, a type setting step for setting a type of update data to be distributed to the communication terminal device, and a type of update data set in the type setting step And a distribution step of distributing one of the all update data to the communication terminal device, and when it is determined in the fee determination step that the communication fee of the communication method varies depending on the communication amount, In the type determination step, a data size is selected from the data size of the difference data acquired in the data size acquisition step and the data size of all the update data. Smaller the update data of the figure, and sets a type of updating data to be distributed to the communication terminal device.

  Furthermore, the program according to claim 5 is a computer comprising a center-side data storage unit that stores data for each version, and an update history storage unit that stores a final update version of data stored in the communication terminal device. And a differential data extracting step of extracting differential data for updating the data stored in the communication terminal device from the data for each version stored in the center-side data storage unit based on the final updated version; , All update data creation step for creating all update data for batch updating the data stored in the communication terminal device to new data, the data size of the difference data extracted in the difference data extraction step, and all the data A data size acquisition step for acquiring the data size of all update data created in the update data creation step; A communication method acquisition step for acquiring a communication method, a fee determination step for determining whether or not the communication fee of the communication method acquired in the communication method acquisition step changes depending on a communication amount, and distribution to the communication terminal device One of the difference data and all the update data is distributed to the communication terminal device in accordance with a type setting step for setting a type of update data to be updated and a type of update data set in the type setting step. Distribution step, and in the fee determination step, when it is determined that the communication fee of the communication method changes depending on the communication amount, in the type determination step, the difference data acquired in the data size acquisition step Update data for distributing update data having a smaller data size out of the data size and the data size of all the update data to the communication terminal device Is a program for executing as a type to set.

  In the data distribution apparatus, the data distribution method, and the program having the above-described configuration, when the communication fee of the communication method varies depending on the communication amount, the smaller of the difference data and the total update data is used as the update data. The data can be selected and distributed to the communication terminal device, and the communication amount of the update data transmitted to the communication terminal device can be reduced to reduce the communication fee.

1 is a block diagram illustrating a map information distribution system according to Embodiment 1. FIG. It is a figure which shows an example of the mesh unit which extracts the difference data of the road classification in a map information delivery center. It is a figure which shows an example of the map management table for every division stored in map data management DB in a map information delivery center. It is a figure which shows an example of the version management table stored in difference data management DB in a map information delivery center. It is a figure which shows an example of the last update version management table stored in navigation update log | history information DB in a map information delivery center. It is the block diagram which showed the navigation apparatus of the map information delivery system. It is a flowchart which shows the "update data distribution process 1" which is the process which CPU of a map information distribution center performs and distributes the data for update for updating navigation map information. It is a flowchart which shows the "update data distribution process 1" which is the process which CPU of a map information distribution center performs and distributes the data for update for updating navigation map information. It is a process which CPU of the map information distribution center which concerns on Example 2 performs, Comprising: It is a flowchart which shows the "update data distribution process 2" which distributes the data for update for updating navigation map information. It is a process which CPU of the map information distribution center which concerns on Example 2 performs, Comprising: It is a flowchart which shows the "update data distribution process 2" which distributes the update data for updating navigation map information.

  Hereinafter, a data distribution apparatus according to the present invention will be described in detail with reference to the drawings based on a first embodiment and a second embodiment in which the map information distribution system is embodied.

First, a schematic configuration of the map information distribution system 1 according to the first embodiment will be described with reference to FIGS. 1 to 6.
As shown in FIG. 1, the map information distribution system 1 according to the first embodiment is a navigation device 2 and update data (difference update data or total update data) for updating map information for the navigation device 2. ), A network 4 and a PC (Personal Computer) 7 owned by a user who can connect to the network 4. The navigation device 2 and the PC 7 and the map information distribution center 3 are configured to be able to transmit and receive various types of information via the network 4. The configuration of the navigation device 2 will be described in detail later with reference to FIG.

  As shown in FIG. 1, the map information distribution center 3 includes a server 10, a center side map information database (center side map information DB) 15 connected to the server 10, a center side communication device 16, and map data. A management database (map data management DB) 17, a difference data management database (difference data management DB) 18, and a navigation update history information database (navigation update history information DB) 19 are provided.

  In addition, the server 10 includes an arithmetic device that controls the entire server 10, a CPU 11 as a control device, a RAM 12 that is used as a working memory when the CPU 11 performs various arithmetic processes, and a navigation device 2 as described later. A ROM 13 in which various control programs for performing “update data distribution processing 1” for distributing update data for updating the map information stored in the navigation device 2 based on the request and time are measured. Timer 14 etc. to be provided.

  Further, in the center-side map information DB 15, basic map information 15 A, which is basic map information for updating the map information created in the map information distribution center 3 and stored in the navigation device 2, is classified for each version. Is remembered. Furthermore, in the center side map information DB 15, as will be described later, a part of the map information stored in the current navigation device 2 (for example, a 40 km square area centered on the current position of the host vehicle or a destination). The difference update data 15B for updating all of them to the latest version stored in the basic map information 15A (hereinafter referred to as “difference update”) is created and stored.

  Further, all the map information stored in the current navigation device 2 is collectively updated to the latest version stored in the basic map information 15A in the center-side map information DB 15 (hereinafter referred to as “all update”). All update data 15C to be generated is created and stored at predetermined time intervals (for example, approximately every 6 hours). Here, the version is creation time information for specifying the time when the map information is created, and the time when the map information is created can be specified by referring to the version.

  The basic map information 15A stored in the center-side map information DB 15 stores various information necessary for route guidance and map display by the navigation device 2, for example, a map for displaying a map. Display data, intersection data for each intersection, node data for node points, link cost for roads (links) as a type of facility, link data such as link length, search data for searching for routes, store as a type of facility For example, facility data related to POI (Point of Interest), search data for searching for points, and the like.

  Here, the map display data is divided into 4 divisions (length 1/2), 16 divisions (1/4), and 64 divisions (1/8) based on a secondary mesh partitioned by about 10 km × 10 km. Each unit is set so that the data amount of each unit is approximately the same level. The smallest 64 division size unit is about 1.25 km square.

  In addition, as shown in FIG. 2, the difference data for each road type is divided into approximately 2.5 km square meshes that divide the secondary mesh partitioned by approximately 10 km × 10 km into 16 (1/4). For each unit, a section number (section ID) for identifying each section (A, B, C, D, E, F, G, H,... For 16 areas in FIG. 2) is set. Inter-city expressway, urban expressway, toll road, highway segment composed of 1-digit, 2-digit national roads, and general road segment composed of 3-digit national roads, major regional roads, prefectural roads, municipal roads Are divided into three distribution road sections of narrow street sections composed of narrow streets, and each version is stored in the basic map information 15A.

  In the following, an intercity highway, an urban highway, a toll road, a single-digit, two-digit national highway are referred to as “highway”. National roads, major local roads, prefectural roads, and municipal roads in the 3-digit range are called “general roads”. A street such as a city narrower than a general road is called a “narrow street”.

Then, the map data management DB 17 stores a version of the map display data for each of the three distribution road sections stored in the basic map information 15A, about 2.5 km square mesh that divides the secondary mesh into 16 (1/4). A map management file 51 for management in units of sections is stored.
Here, as shown in FIG. 3, in the map management file 51, for each road section, a “section ID” that identifies each section of about 2.5 km square that divides the secondary mesh into 16 (1/4). Further, for each partition, a version that is sequentially updated from the first generation version 1 (Ver. 1) to the latest version (Ver. N) is stored in association with each other.

  In addition, the difference data management DB 18 stores each difference that is sequentially updated from the first generation version 1 to the latest version for each about 2.5 km square partition unit that divides the secondary mesh into 16 (1/4). A version management table 52 for managing data versions is stored. The version management table 52 is provided for each of the three distribution road sections stored in the basic map information 15A.

  Here, as shown in FIG. 4, the version management table 52 has the “partition ID” for each “partition ID” that identifies each section of about 2.5 km square that divides the secondary mesh into 16 (1/4). "Version" representing a version that is sequentially updated from "version 1" of the first generation of the difference data to "the latest version" and "version one generation before" representing a version one generation before each version Has been.

  For example, in the version history of each differential data that has been sequentially updated in the partition whose “partition ID” is “1”, the version of the first difference data is “version 1” and “version one generation before” indicates “no”. -". The version of the difference data updated next is “version 2”, and the “version one generation before” is “version 1”. The version of the difference data updated next is “version 4”, and the “version one generation before” is “version 2”. Furthermore, the version of the latest difference data is “version 5”, and the “version one generation before” is “version 4”.

The navigation update history information DB 19 stores a final update version management table 53 for managing an update history of the map information stored in each navigation device 2 updated so far. The last updated version management table 53 is provided for each of the three distribution road sections stored in the basic map information 15A.
Here, as shown in FIG. 5, the last updated version management table 53 is set to “section ID” assigned to each section of about 2.5 km square for each “navigation identification ID” that identifies the navigation device 2. On the other hand, the version of the map information currently stored in the navigation device 2, that is, the “current section version” representing the last updated version is stored.

  For example, the “version” of the map information currently stored in the navigation device 2 whose “navigation identification ID” is “1001” is the last updated version of the map data for the area whose “section ID” is “1”. The “current section version” is “version 4”, the “current section version” indicating the final update version of the map data is “version 4” for the area whose “section ID” is “2”, and “ For the area of “section ID” “3”, “current section version” representing the latest update version of the map data is “version 1”.

  And every time the update data of the navigation map information 38 (see FIG. 6) of the navigation device 2 is distributed as will be described later, the latest update version management table 53 shows the latest corresponding to each updated “section ID”. “Current partition version” is stored and rewritten to a new update history.

  The network 4 is a communication line network such as a LAN (Local Area Network), a WAN (Wide Area Network), an intranet, a cellular phone line network, a telephone line network, a public communication line network, a dedicated communication line network, an Internet line, etc. Etc. can be used.

  Further, as shown in FIG. 1, the PC 7 transmits and receives the communication device 7A that communicates with the map information distribution center 3 and the like via the network 4, and transmits and receives the difference update data 15B and the total update data 15C and the like between them. To do. The PC 7 stores in advance coordinate data (for example, latitude and longitude) of the user's home position, a navigation identification ID that identifies the navigation device 2, a user ID that identifies the user, a user password, and the like. .

  Then, when a distribution request instruction for requesting distribution of update data for the navigation map information 38 is input from the keyboard or the like, the PC 7 requests an update request for requesting distribution of update data for the navigation map information 38. Together with the “user ID” and “navigation identification ID” to the map information distribution center 3 via the communication device 7A. At the same time, the PC 7 transmits the coordinate data of the home position (for example, latitude and longitude data) to the map information distribution center 3.

  Next, a schematic configuration of the navigation device 2 configuring the map information distribution system 1 according to the first embodiment will be described with reference to FIG.

  As shown in FIG. 6, the navigation device 2 according to the first embodiment has a current location detection processing unit 21 that detects a current position of the own vehicle (hereinafter referred to as “own vehicle position”), and various data are recorded. Based on the data recording unit 22, the navigation control unit 23 that performs various arithmetic processes based on the input information, the operation unit 24 that receives operations from the operator, and information such as a map is displayed to the operator. It comprises a liquid crystal display 25, a speaker 26 that outputs voice guidance related to route guidance, and a communication device 27 that communicates with the road traffic information center, the map information distribution center 3, etc. via a mobile phone network or the like. Yes. The navigation control unit 23 may be configured to receive an output signal of a vehicle speed sensor (not shown) that detects the traveling speed of the vehicle.

  Hereinafter, each component constituting the navigation device 2 will be described. The current location detection processing unit 21 includes a GPS 31 and the like, and can detect the vehicle position, the vehicle direction, the travel distance, and the like. In addition, you may make it connect a direction sensor, a distance sensor, etc. which are not shown in figure to the present location detection process part 21. FIG.

  The data recording unit 22 includes an external storage device, a hard disk (not shown), a flash memory (not shown), etc. as a storage medium, and a navigation side map stored in the hard disk, the flash memory (not shown), etc. An information database (navigation-side map information DB) 37 and a driver (not shown) for reading predetermined programs and the like and writing predetermined data to a hard disk, a flash memory, and the like are provided.

  Here, the navigation-side map information DB 37 stores navigation map information 38 that is used for travel guidance and route search of the navigation device 2 and is to be updated by the map information distribution center 3. The navigation map information 38 includes various kinds of information necessary for route guidance and map display, like the basic map information 15A. For example, new road information for identifying each new road, map display data for displaying a map, intersection data for each intersection, node data for node points, link costs for roads (links) as a kind of facility, etc. It consists of link data, search data for searching for routes, store data related to POIs such as stores that are a kind of facility, search data for searching points, and the like.

  The contents of the navigation map information 38 are updated by downloading update data such as the difference update data 15B and the total update data 15C distributed from the map information distribution center 3 via the communication device 27.

  Further, the navigation control unit 23 is used as a working memory when the CPU 41 performs various kinds of arithmetic processing, and the route of the searched guide route as the CPU 41 as the arithmetic device and the control device for controlling the entire navigation device 2. A RAM 42 in which data and the like are stored, a ROM 43 in which a control program, a map data update processing program for performing a difference update or a total update of the navigation map information 38 based on the received difference update data 15B and the total update data 15C, and the like are stored. An internal storage device such as a flash memory 44 that stores programs read from the ROM 43 and various application programs is provided.

  Furthermore, the navigation control unit 23 is electrically connected to peripheral devices (actuators) of the operation unit 24, the liquid crystal display 25, the speaker 26, and the communication device 27.

  The operation unit 24 is operated when correcting the current location at the start of travel, inputting a departure point as a guidance start point and a destination as a guidance end point, or when searching for information about facilities, etc. The update request button 24A for inputting an update request instruction for requesting distribution of update data for the navigation map information 38 to the center 3, various keys, and a plurality of operation switches are included.

  Then, the navigation control unit 23 performs control to execute various corresponding operations based on switch signals output by pressing the switches. Further, a touch panel that constitutes the operation unit 24 is provided on the front surface of the liquid crystal display 25, and various instruction commands can be input by pressing down buttons displayed on the screen.

  Here, when the update request button 24A of the operation unit 24 is operated when the ACC is turned on or the destination is set, the CPU 41 issues an update request instruction for requesting distribution of the update data of the navigation map information 38. Along with a “navigation identification ID” (for example, a navigation identification ID “1001”) that identifies the navigation device 2, it is transmitted to the map information distribution center 3 via the communication device 27. At the same time, the CPU 41 detects the vehicle position by the current location detection processing unit 21 and transmits coordinate data (for example, latitude and longitude data) of the vehicle position to the map information distribution center 3. Further, when the destination is set via the operation unit 24, the CPU 41 also transmits the coordinate data of the destination to the map information distribution center 3.

In addition to a route guidance screen on which a map based on the navigation map information 38 is displayed and traffic information on each link is displayed on the liquid crystal display 25, operation guidance, operation menu, key guidance, from the current location to the destination Guide route, guide information along the guide route, traffic information, news, weather forecast, time, mail, TV program, etc. are displayed.
In addition, the speaker 26 outputs voice guidance or the like for guiding traveling along the guidance route based on an instruction from the navigation control unit 23. Here, the voice guidance to be guided includes, for example, “200m ahead, turn right at XX intersection”.

  The communication device 27 is a communication means such as a mobile phone network composed of a vehicle communication module or a mobile phone. The communication device 27 communicates with the map information distribution center 3 using the difference update data 15B, all update data 15C, and current traffic. Send and receive information.

[Update data distribution process 1]
Next, “update data distribution processing 1” executed by the CPU 11 of the map information distribution center 3 for distributing update data for updating the navigation map information 38 will be described with reference to FIGS. 7 and 8 are stored in the ROM 13 of the map information distribution center 3 and executed by the CPU 11 at regular intervals (for example, every 10 msec to 100 msec).

  As shown in FIGS. 7 and 8, first, the CPU 11 of the map information distribution center 3 in the step (hereinafter abbreviated as “S”) 11 from the navigation device 2 or the PC 7 via the center side communication device 16. Whether the navigation identification ID and the vehicle position or the coordinate data of the destination, or the user ID, the navigation identification ID and the coordinate data of the home position are received together with the update request instruction for requesting the distribution of the update data of the information 38 A determination process for determining

  And when it determines with not receiving the update request instruction | indication which requests | requires delivery of the update data of the navigation map information 38 from the navigation apparatus 2 (S11: NO), CPU11 complete | finishes the said process.

  On the other hand, together with an update request instruction for requesting delivery of update data for the navigation map information 38 from the navigation device 2, the navigation identification ID and the vehicle position or the coordinate data of the destination, or the user ID, the navigation identification ID, and the home position. If it is determined that the coordinate data has been received (S11: YES), the CPU 11 receives the received update request instruction, navigation identification ID, own vehicle position or destination, or user ID, navigation identification ID, and home position coordinates. After the data is stored in the RAM 12, the process proceeds to S12.

  In S12, the CPU 11 reads the coordinate data of the own vehicle position or the home position from the RAM 12, and a predetermined area centered on the coordinate data of the own vehicle position or the home position (for example, about 40 km centered on the own vehicle position or the home position). Is an area to be distributed from which difference data is extracted. Further, when the coordinate data of the destination is stored in the RAM 12, the CPU 11 reads the coordinate data of the destination from the RAM 12 again, and a predetermined area (for example, the destination is centered on the coordinate data of the destination). This is an additional area to be extracted from which the difference data is extracted. Then, the CPU 11 specifies the section ID of each section partitioned into approximately 2.5 km square mesh in this distribution target area based on the basic map information 15A, and stores it in the RAM 12.

  Subsequently, the CPU 11 stores the current version of the “highway” in the navigation map information 38 stored in the navigation device 2 corresponding to the received navigation identification ID in the navigation update history information DB 19. It reads sequentially from the last updated version management table 53 of the stored “highway”. Further, the CPU 11 sequentially reads the latest versions of all sections of the “highway” from the map management file 51 stored in the map data management DB 17 and reads the current version of the same section read from the last update version management table 53. A newer version of the section is extracted and stored in the RAM 12 as an updated section of the “highway”.

  In addition, the CPU 11 stores the current version of “general road” of each section in the distribution target area of the navigation map information 38 stored in the navigation device 2 corresponding to the received navigation identification ID in the navigation update history information DB 19. It reads sequentially from the last updated version management table 53 of the stored “general road”. Further, the CPU 11 sequentially reads the latest version of “general road” of each section in the distribution target area from the map management file 51 stored in the map data management DB 17 and reads the same from the last update version management table 53. A section different from the current version of the section is extracted and stored in the RAM 12 as an update section of “general road”.

  In addition, the CPU 11 stores the current version of “narrow street” of each section in the distribution target area of the navigation map information 38 stored in the navigation device 2 corresponding to the received navigation identification ID in the navigation update history information DB 19. It reads sequentially from the last updated version management table 53 of the stored “narrow street”. Further, the CPU 11 sequentially reads the latest version of the “narrow street” of each section in the distribution target area from the map management file 51 stored in the map data management DB 17 and reads the same from the last update version management table 53. A section different from the current version of the section is extracted and stored in the RAM 12 as an updated section of “narrow street”.

  Subsequently, the CPU 11 sequentially reads the update section of “highway”, the update section of “general road”, and the update section of “narrow street”, and whether or not at least one of the update sections is stored. That is, a determination process is performed for determining whether or not there is update data for the navigation map information 38 stored in the navigation device 2 corresponding to the received navigation identification ID.

  And when it determines with the data for the update of the navigation map information 38 memorize | stored in the navigation apparatus 2 corresponding to the received navigation identification ID not existing (S12: NO), CPU11 transfers to the process of S13. .

  In S <b> 13, when only the navigation identification ID is received in S <b> 11, the CPU 11 specifies “absence notification information” indicating that the update data of the navigation map information 38 does not exist by the navigation identification ID. To the navigation device 2. Further, when the user ID and the navigation identification ID are received in S11, “non-existence notification information” indicating that the update data of the navigation map information 38 does not exist is transmitted to the PC 7 specified by the user ID. To do. Then, the CPU 11 ends the process.

  On the other hand, when it is determined that there is update data of the navigation map information 38 stored in the navigation device 2 corresponding to the received navigation identification ID (S12: YES), the CPU 11 proceeds to the process of S14. In S <b> 14, the CPU 11 acquires the current processing load, and determines whether the ratio of the current processing load to the maximum processing load that can be processed is less than a predetermined load threshold (for example, a load ratio of 50%). The determination process to be executed is executed. That is, the CPU 11 executes a determination process for determining whether or not the current processing load is low and the difference update data 15B can be created.

  If it is determined that the ratio of the current processing load to the maximum processing load is equal to or greater than the predetermined load threshold (S14: NO), the CPU 11 proceeds to the process of S15. In S15, the CPU 11 transmits the update data 15C stored in the center-side map information DB 15 to the navigation device 2 specified by the navigation identification ID received in S11 or the PC 7 specified by the user ID. Then, the process proceeds to S19 described later.

  Specifically, the CPU 11 reads the update data flag from the RAM 12, sets the update data flag to “on”, stores the update data flag in the RAM 12 again, and then proceeds to the process of S19 described later. The update data flag is set to “off” and stored in the RAM 12 when the server 10 is started.

  On the other hand, when it is determined that the ratio of the current processing load to the maximum processing load is less than the predetermined load threshold (S14: YES), the CPU 11 proceeds to the process of S16. In S <b> 16, the CPU 11 creates difference update data 15 </ b> B and stores it in the center-side map information DB 15.

  Specifically, first, the CPU 11 sequentially reads update sections of “highway” from the RAM 12, and updates the update version for updating the version of “highway” of each update section to the latest version using differential data management. The data is read from the “highway” version management table 52 stored in the DB 18 and stored in the RAM 12. Then, the CPU 11 sequentially reads the difference data corresponding to the update version of each update section of the “highway” from the basic map information 15A, and updates each “highway” as the difference update data 15B of “highway” nationwide. The information is stored in the center-side map information DB 15 in association with the sections.

  Further, the CPU 11 sequentially reads update sections of “general roads” from the RAM 12, and stores an update version for updating the version of “general road” of each update section to the latest version in the differential data management DB 18. Is read from the version management table 52 of the “general road”. Then, the CPU 11 sequentially reads out the difference data corresponding to the update version of each update section of “general road” from the basic map information 15A, and sets “general road” as the difference update data 15B of “general road” in the distribution target area. Are stored in the center-side map information DB 15 in correspondence with each update section.

  Further, the CPU 11 sequentially reads update sections of “narrow streets” from the RAM 12, and stores an update version for updating the version of “narrow streets” of each update section to the latest version in the difference data management DB 18. Is read from the version management table 52 of “Narrow street”. Then, the CPU 11 sequentially reads the difference data corresponding to the update version of each update section of “Narrow Street” from the basic map information 15A, and “Narrow Street” as the difference update data 15B of “Narrow Street” in the distribution target area. Are stored in the center-side map information DB 15 in correspondence with each update section.

  Subsequently, in S17, the CPU 11 calculates the data sizes of the difference update data 15B and the total update data 15C stored in the center-side map information DB 15, and the data size of the difference update data 15B is the total update data 15C. A determination process for determining whether or not the data size is smaller is executed. If it is determined that the data size of the difference update data 15B is larger than the data size of all the update data 15C (S17: NO), the CPU 11 proceeds to the process of S15.

  On the other hand, if it is determined that the data size of the difference update data 15B is smaller than the data size of all the update data 15C (S17: YES), the CPU 11 proceeds to the process of S18. In S18, the CPU 11 sets the difference update data 15B stored in the center-side map information DB 15 as update data to be transmitted to the navigation device 2 specified by the navigation identification ID received in S11. Specifically, the CPU 11 reads the update data flag from the RAM 12, sets the update data flag to “off”, and stores the update data flag in the RAM 12 again.

  Subsequently, in S19, the CPU 11 sends an update request instruction for requesting distribution of the update data received in S11 to the communication device 27 (mobile communication) configured by the vehicle communication module or the mobile phone of the navigation device 2. A determination process for determining whether or not the data has been received from the machine is executed. Specifically, when only the navigation identification ID is received in S11, the CPU 11 determines that the navigation ID is received from the communication device 27 of the navigation device 2, and the user ID and the navigation identification ID in S11. Is received from the communication device 7A of the PC 7.

  The update request instruction for requesting distribution of the update data received in S11 is not received from the communication device 27 (mobile communication device) of the navigation device 2, that is, received from the communication device 7A of the PC 7. If it is determined that it is (S19: NO), the CPU 11 proceeds to the process of S22 described later.

  On the other hand, when it is determined that the update request instruction for requesting distribution of the update data received in S11 is received from the communication device 27 (mobile communication device) of the navigation device 2 (S19: YES). The CPU 11 proceeds to the process of S20.

  In S20, the CPU 11 executes a determination process for determining whether or not the update request instruction for requesting the distribution of the update data is transmitted by the user operating the update request button 24A. That is, the CPU 11 reads the update request instruction from the RAM 12 and executes a determination process for determining whether or not the operation bit added to the update request instruction is set to “1”.

  It should be noted that an operation bit indicating that the update request button 24A has been operated is added to the update request instruction for requesting distribution of update data, and when the update request button 24A is operated, the operation bit is If it is set to “1” and an update request instruction is automatically transmitted when the ACC is ON or the destination is set, the operation bit is set to “0”.

  Then, when it is determined that the update request instruction for requesting distribution of the update data is transmitted by the user operating the update request button 24A, that is, when the operation bit is set to “1”. (S20: YES), CPU11 transfers to the process of below-mentioned S22.

  On the other hand, the update request instruction for requesting the distribution of the update data is not sent by the user by operating the update request button 24A, that is, the operation bit is set to “0” and the ACC is turned on or the destination If it is determined that it is automatically transmitted at the time of setting (S20: NO), the CPU 11 proceeds to S21.

  In S21, the CPU 11 searches for a route from the vehicle position to the destination by the Dijkstra method or the like, and calculates a required time to reach the destination. Then, the CPU 11 calculates the maximum data size that can be transmitted by multiplying the average communication speed when receiving an update request instruction or the like for requesting distribution of update data from the navigation device 2 by the time required to reach the destination. To do.

  Subsequently, the CPU 11 reads the update data flag, and when the update data flag is “OFF”, whether or not the data size of the differential update data 15B is equal to or less than the maximum data size that can be transmitted, and the update data When the flag is “ON”, a determination process for determining whether or not the data size of all the update data 15C is equal to or less than the maximum transmittable data size is executed. That is, the CPU 11 executes a determination process for determining whether or not the navigation device 2 can complete the download of the update data for updating the navigation map information 38 within a communicable time.

  If the navigation device 2 determines that the download of the update data for updating the navigation map information 38 can be completed within the communicable time (S21: YES), the CPU 11 proceeds to the process of S22.

  In S22, the CPU 11 reads the update data flag. When the update data flag is “off”, the CPU 11 reads the difference update data 15B from the center-side map information DB 15 as update data and sets it as update data for updating the navigation map information 38. . When the update data flag is “ON”, the CPU 11 reads all update data 15C from the center-side map information DB 15 and sets it as update data for updating the navigation map information 38.

  When the CPU 11 receives only the navigation identification ID in S11, the CPU 11 transmits update data for updating the navigation map information 38 to the navigation device 2 specified by the navigation identification ID, and then The process ends. Further, when the CPU 11 receives the user ID and the navigation identification ID in S11, the CPU 11 transmits update data for updating the navigation map information 38 to the PC 7 specified by the user ID, and then performs the processing. Exit.

  On the other hand, if the navigation device 2 determines that the download of the update data for updating the navigation map information 38 cannot be completed within the communicable time in S21 (S21: NO), the CPU 11 performs the process of S23. Transition. In S23, the CPU 11 requests distribution of the update data of the navigation map information 38 when communication is possible, such as when the ACC is turned on or the destination is set next time, or when the update request button 24A of the operation unit 24 is operated. After transmitting “retransmission instruction information” instructing to retransmit the update request instruction or the like to the navigation device 2 specified by the navigation identification ID received in S11, the process is terminated.

  As described above in detail, in the map information distribution system 1 according to the first embodiment, the CPU 11 of the map information distribution center 3 determines that the ratio of the current processing load to the maximum processing load that can be processed is less than the predetermined load threshold. One of the difference update data 15B and all update data 15C having the smaller data size can be selected and transmitted to the navigation device 2 or the PC 7 as update data for updating the navigation map information 38. Thereby, CPU11 can reduce the communication amount of the data for update which updates the navigation map information 38 transmitted to the navigation apparatus 2 or PC7, and can aim at reduction of a communication charge.

  Further, when the CPU 11 determines that the ratio of the current processing load to the maximum processing load that can be processed is equal to or greater than the predetermined load threshold, the CPU 11 updates the navigation map information 38 to the navigation device 2 or the PC 7. Delivered as update data. As a result, the CPU 11 can quickly distribute update data for updating the navigation map information 38 to the navigation device 2 or the PC 7 even if the current processing load ratio is equal to or greater than the predetermined load threshold.

  Further, when the update request instruction for requesting distribution of the received update data is transmitted from the navigation device 2 when the ACC is turned on or when the destination is set, the CPU 11 within the communicable time, Only when the navigation device 2 determines that the download of the update data can be completed, the update data for updating the navigation map information 38 is distributed to the navigation device 2. As a result, the CPU 11 can reliably distribute the update data for updating the navigation map information 38 to the navigation device 2.

Next, the map information distribution system 101 according to the second embodiment will be described with reference to FIGS. In addition, the same code | symbol as the map information delivery system 1 which concerns on the said Example 1 shows the same part as the map information delivery system 1 which concerns on the said Example 1, or an equivalent part.
The overall configuration of the map information distribution system 101 according to the second embodiment is substantially the same as that of the map information distribution system 1 according to the first embodiment. Further, the control configuration and control processing of the map information distribution system 101 according to the second embodiment are substantially the same as the control configuration and control processing of the map information distribution system 1 according to the first embodiment.

  However, in the map information distribution system 101 according to the second embodiment, the CPU 11 of the map information distribution center 3 replaces “update data distribution processing 1” for distributing update data for updating the navigation map information 38, which will be described later. This is different from the map information distribution system 1 according to the first embodiment in that the “update data distribution process 2” is executed.

[Update data distribution process 2]
Here, “update data distribution processing 2”, which is executed by the CPU 11 of the map information distribution center 3 and distributes update data for updating the navigation map information 38, will be described with reference to FIGS. 9 and 10 is stored in the ROM 13 of the map information distribution center 3, and is executed by the CPU 11 at regular intervals (for example, every 10 msec to 100 msec).

As shown in FIGS. 9 and 10, first, the CPU 11 of the map information distribution center 3 executes the processes of S11 to S13 in S111 to S113.
And when it determines with the data for the update of the navigation map information 38 memorize | stored in the navigation apparatus 2 corresponding to the received navigation identification ID existing (S112: YES), CPU11 transfers to the process of S114.

  In S <b> 114, the CPU 11 calculates the approximate data size of the difference update data 15 </ b> B and stores it in the RAM 12. Specifically, first, the CPU 11 sequentially reads the update sections of “highway” from the RAM 12 and counts the number of update sections of “highway”. Then, the CPU 11 stores a value obtained by multiplying the number of update sections of the “highway” by the average difference data size per section of the “highway” in the RAM 12 as the approximate data size of the difference update data 15B of the “highway”. . The average difference data size per section of the “highway” is stored in advance in the center side map information DB 15.

  Further, the CPU 11 sequentially reads the update sections of “general road” from the RAM 12 and counts the number of update sections of “general road”. Then, the CPU 11 stores a value obtained by multiplying the number of update sections of “general road” by the average difference data size per section of “general road” in the RAM 12 as an approximate data size of the difference update data 15B of “general road”. . The average difference data size per section of “general road” is stored in advance in the center-side map information DB 15.

  In addition, the CPU 11 sequentially reads the update sections of “narrow streets” from the RAM 12 and counts the number of update sections of “narrow streets”. Then, the CPU 11 stores a value obtained by multiplying the number of update sections of “narrow street” by the average difference data size per section of “narrow street” in the RAM 12 as the approximate data size of the difference update data 15B of “narrow street”. . The average difference data size per section of “narrow street” is stored in advance in the center-side map information DB 15.

  Then, the CPU 11 reads out the total data size of the differential update data 15B for each of “highway”, “general road”, and “narrow street” from the RAM 12 and sums them up, and stores them in the RAM 12 as the approximate data size of the differential update data 15B. To do.

  Subsequently, in S115, the CPU 11 determines whether or not the communication fee of the communication method changes depending on the communication amount from the information of the communication method added to the update request instruction for requesting the distribution of the update data received in S111. A determination process for determining is executed.

  Note that the user registers in advance in the navigation apparatus 2 and the PC 7 beforehand whether or not the communication fee of the communication method changes depending on the communication amount. In addition, a charge bit indicating that the communication charge of the communication method changes is added to the update request instruction for requesting distribution of update data. Then, when the CPU 41 or the PC 7 of the navigation device 2 transmits the update request instruction to the map information distribution center 3, if the communication fee changes depending on the communication amount, the fee bit is set to “1”, and the communication fee is set. Is not changed depending on the traffic, the charge bit is set to “0”.

  When it is determined from the communication method information added to the update request instruction for requesting distribution of the update data received in S111 that the communication fee of the communication method changes depending on the communication amount, that is, the charge bit is “1”. "Is set to" "(S115: YES), the CPU 11 proceeds to the process of S116.

  In S116, the CPU 11 calculates the data size of all update data 15C stored in the center-side map information DB 15. Then, the CPU 11 reads out the approximate data size of the difference update data 15B from the RAM 12, and executes a determination process for determining whether the approximate data size of the difference update data 15B is smaller than the data size of all the update data 15C.

  If it is determined that the approximate data size of the difference update data 15B is larger than the data size of all the update data 15C (S116: NO), the CPU 11 proceeds to the process of S121 described later. On the other hand, when it is determined that the approximate data size of the difference update data 15B is smaller than the data size of all the update data 15C (S116: YES), the CPU 11 proceeds to the process of S122 described later.

  On the other hand, when it is determined in S115 that the communication fee of the communication method does not change depending on the communication amount from the information of the communication method added to the update request instruction for requesting the distribution of the update data received in S111, that is, When the bit is set to “0” (S115: NO), the CPU 11 proceeds to the process of S117.

  In S117, the CPU 11 obtains the current processing load, calculates the time required to create the difference update data 15B in the processing load state, and stores it in the RAM 12. Specifically, the CPU 11 reads out the approximate data size of the difference update data 15B from the RAM 12, and sets the creation time necessary for creating the difference update data 15B in the processing load state from the approximate data size of the difference update data 15B. Calculate and store in RAM 12.

  In S118, the CPU 11 uses the average communication speed when the update request instruction requesting distribution of update data is received from the navigation device 2 or the PC 7 in S111, and the approximate data size and total update of the difference update data 15B. Each of the data sizes of the data 15C is divided to calculate a transmission time for transmitting each of the difference update data 15B and all the update data 15C to the navigation device 2 or the PC 7 and store it in the RAM 12.

  After that, in S119, the CPU 11 reads out the creation time necessary for creating the differential update data 15B and the transmission time for transmitting the differential update data 15B to the navigation device 2 or the PC 7 from the RAM 12, and sums them up. The update required time of 15B is stored in the RAM 12. In addition, the CPU 11 reads from the RAM 12 the transmission time for transmitting the all update data 15C to the navigation device 2 or the PC 7, and stores it in the RAM 12 as the required update time for the all update data 15C.

  Subsequently, in S120, the CPU 11 reads the update required times of the differential update data 15B and the total update data 15C from the RAM 12, and the update required time of the differential update data 15B is shorter than the update required time of the total update data 15C. Judgment processing is performed to determine whether or not. When it is determined that the update required time of the difference update data 15B is equal to or longer than the update required time of all the update data 15C (S120: NO), the CPU 11 proceeds to the process of S121. In S121, after executing the process of S15, the CPU 11 proceeds to the process of S124 described later. That is, the CPU 11 sets the update data flag to “on” and stores it in the RAM 12, and then proceeds to the process of S124 described later.

On the other hand, when it is determined that the update required time of the difference update data 15B is shorter than the update required time of all the update data 15C (S120: YES), the CPU 11 proceeds to the process of S122. In S122, the CPU 11 executes the process of S18. That is, the CPU 11 sets the update data flag to “off” and stores it in the RAM 12.
Subsequently, in S123, the CPU 11 executes the process of S16, creates difference update data 15B, and stores it in the center-side map information DB 15.

  In S124, the CPU 11 reads the update data flag. When the update data flag is “off”, the CPU 11 reads the difference update data 15B from the center-side map information DB 15 as update data and sets it as update data for updating the navigation map information 38. . When the update data flag is “ON”, the CPU 11 reads all update data 15C from the center-side map information DB 15 and sets it as update data for updating the navigation map information 38.

  If the CPU 11 receives only the navigation identification ID in S111, the CPU 11 transmits update data for updating the navigation map information 38 to the navigation device 2 specified by the navigation identification ID, and then The process ends. Further, when the CPU 11 receives the user ID and the navigation identification ID in S111, the CPU 11 transmits update data for updating the navigation map information 38 to the PC 7 specified by the user ID, and then performs the processing. Exit.

  As described above in detail, in the map information distribution system 101 according to the second embodiment, when the CPU 11 of the map information distribution center 3 receives an update request instruction or the like requesting distribution of update data from the navigation device 2 or the PC 7. When the communication charge of the communication method of the above changes depending on the traffic, the smaller update data 15B and all update data 15C are selected, and the navigation map information 38 is sent to the navigation device 2 or the PC 7. It can be transmitted as update data to be updated. Thereby, CPU11 can reduce the communication amount of the data for update which updates the navigation map information 38 transmitted to the navigation apparatus 2 or PC7, and can aim at reduction of a communication charge.

  In addition, when the communication fee of the communication method when receiving an update request instruction for requesting distribution of update data from the navigation device 2 or the PC 7 does not change depending on the communication amount, the CPU 11 and the update data 15B and the total update Of the data 15C, it is possible to select and distribute the shorter update time required for transmission to the navigation device 2 or the PC 7. Thereby, the data update time of the navigation map information 38 in the navigation device 2 or the PC 7 can be shortened.

  In addition, this invention is not limited to the said Example 1 and Example 2, Of course, various improvement and deformation | transformation are possible within the range which does not deviate from the summary of this invention. For example, the following may be used.

[Other Example 1]
(A) For example, in the map information distribution system 101 according to the second embodiment, the CPU 11 of the map information distribution center 3 is added to the update request instruction for requesting the distribution of the update data received in S111 in S115. When it is determined from the communication method information that the communication fee of the communication method does not change depending on the communication amount (S115: NO), the process of S14 may be executed.

And when it determines with the ratio of the present process load with respect to the maximum process load being more than a predetermined load threshold value, you may make it perform CPU11 to the process after said S121.
On the other hand, when it is determined that the ratio of the current processing load to the maximum processing load is less than the predetermined load threshold, the CPU 11 may execute the processing after S117.

  Thereby, the CPU 11 does not change the communication fee of the communication method when receiving an update request instruction or the like for requesting distribution of update data from the navigation device 2 or the PC 7, and the current processing load is predetermined. When the load threshold value is exceeded, the entire update data 15C can be transmitted to the navigation device 2 or the PC 7 as update data for updating the navigation map information 38. As a result, the CPU 11 can reduce the processing load, and can quickly distribute update data for updating the navigation map information 38 to the navigation device 2 or the PC 7.

  Further, the CPU 11 does not change the communication fee of the communication method depending on the communication amount when receiving the update request instruction for requesting the distribution of the update data from the navigation device 2 or the PC 7, and the current processing load is a predetermined load. If it is less than the threshold value, it becomes possible to select and distribute the difference update data 15B and all the update data 15C with the shorter update time required for transmission to the navigation device 2 or the PC 7. Thereby, CPU11 can shorten the data update time of the navigation map information 38 in the navigation apparatus 2 or PC7 in consideration of processing load.

[Other Example 2]
(B) Further, for example, in the first and second embodiments described above, the system has been described as a system for updating map information, but a system for updating a navigation program instead of map information may be used. In that case, the map information distribution system 1 is referred to as the program distribution system 1, the map information distribution center 3 as the program distribution center 3, and the various map information databases as the program database. Should be replaced with a program.

1, 101 Map information distribution system 2 Navigation device 3 Map information distribution center 4 Network 7 PC
7A, 27 Communication device 10 Server 11, 41 CPU
12, 42 RAM
13, 43 ROM
15 Center side map information DB
15A Basic map information 15B Differential update data 15C All update data 16 Center side communication device 17 Map data management DB
18 Differential data management DB
19 Navi update history information DB
37 Navi side map information DB
38 Navi Map Information

Claims (5)

Center side data storage means for storing data for each version;
Update history storage means for storing the latest update version of the data stored in the communication terminal device;
Differential data extraction means for extracting difference data for updating data stored in the communication terminal device from data for each version stored in the center-side data storage means based on the last update version;
All update data creating means for creating all update data for collectively updating the data stored in the communication terminal device to new data;
Data size acquisition means for acquiring the data size of the difference data and the data size of all the update data;
A communication method acquisition means for acquiring a communication method with the communication terminal device;
Charge determining means for determining whether or not the communication charge of the communication method changes depending on the communication amount;
Type setting means for setting the type of update data to be distributed to the communication terminal device;
Distribution means for distributing one of the difference data and all the update data to the communication terminal device according to the type of update data set by the type setting means,
With
The type setting means, when the charge determining means determines that the communication charge of the communication method changes depending on the traffic, the data size of the difference data acquired via the data size acquiring means and the total update A data distribution apparatus, wherein update data having a smaller data size among data sizes is set as a type of update data to be distributed to the communication terminal apparatus. A processing load acquisition means for acquiring processing load information related to a current processing load when the charge determination means determines that the communication charge of the communication method does not change depending on the communication amount;
Threshold determination means for determining whether the current processing load is less than a predetermined load threshold based on the processing additional information;
With
The type setting unit sets the all update data as a type of update data to be distributed to the communication terminal device when the threshold determination unit determines that the current processing load is equal to or greater than a predetermined load threshold. The data distribution apparatus according to claim 1. When it is determined by the fee determining means that the communication fee of the communication method does not change depending on the communication amount, the update required time until the update of the difference data and all the update data in the communication terminal device is completed is acquired. The required time acquisition means to
The type setting means is for updating the shorter update time out of the update time required for the communication terminal device to update the difference data and all the update data acquired by the required time acquisition means. The data distribution apparatus according to claim 1, wherein data is set as a type of update data to be distributed to the communication terminal apparatus. Data executed by a server including at least a control unit, a center side data storage unit that stores data for each version, and an update history storage unit that stores a final update version of data stored in the communication terminal device A delivery method,
Executed by the control unit;
Based on the last update version, a difference data extraction step for extracting difference data for updating data stored in the communication terminal device from data for each version stored in the center-side data storage unit;
All update data creating step for creating all update data for batch updating the data stored in the communication terminal device to new data;
A data size acquisition step of acquiring the data size of the difference data extracted in the difference data extraction step and the data size of all the update data created in the all update data creation step;
A communication method acquisition step of acquiring a communication method with the communication terminal device;
A charge determination step of determining whether or not the communication fee of the communication method acquired in the communication method acquisition step changes depending on a communication amount;
A type setting step for setting a type of update data to be distributed to the communication terminal device;
A distribution step of distributing one of the difference data and all the update data to the communication terminal device according to the type of the update data set in the type setting step;
With
If it is determined in the fee determination step that the communication fee of the communication method changes depending on the communication volume, the data size of the difference data acquired in the data size acquisition step and the total update data in the type determination step A data distribution method characterized by setting update data having a smaller data size among data sizes as a type of update data to be distributed to the communication terminal device. In a computer comprising center-side data storage means for storing data for each version, and update history storage means for storing a final update version of data stored in the communication terminal device,
Based on the last update version, a difference data extraction step for extracting difference data for updating data stored in the communication terminal device from data for each version stored in the center-side data storage unit;
All update data creating step for creating all update data for batch updating the data stored in the communication terminal device to new data;
A data size acquisition step of acquiring the data size of the difference data extracted in the difference data extraction step and the data size of all the update data created in the all update data creation step;
A communication method acquisition step of acquiring a communication method with the communication terminal device;
A charge determination step of determining whether or not the communication fee of the communication method acquired in the communication method acquisition step changes depending on a communication amount;
A type setting step for setting a type of update data to be distributed to the communication terminal device;
A distribution step of distributing one of the difference data and all the update data to the communication terminal device according to the type of the update data set in the type setting step;
And execute
If it is determined in the fee determination step that the communication fee of the communication method changes depending on the communication volume, the data size of the difference data acquired in the data size acquisition step and the total update data in the type determination step A program for executing update data having a smaller data size among data sizes to be set as a type of update data to be distributed to the communication terminal device.

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