JP2017174132A - Transmission device, terminal device, transmission method, and transmission program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform data update with an appropriate data amount regardless of data update frequency.SOLUTION: A transmission device 100 includes: an acquisition unit 101 which acquires version information on map data from a terminal device; a recording unit 102 which records, as update data of a map, first update data for updating data of unchanged roads as well as changed roads and second update data for updating data of changed roads; a determination unit 103 which determines any of the first update data and the second update data by comparing the version information with version information corresponding to the update data; and a transmission unit 104 which transmits the determined update data.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transmission device, a terminal device, a transmission method, and a transmission program related to transmission of map update data. However, the use of the present invention is not limited to the transmission device, the terminal device, the transmission method, and the transmission program.

  Conventionally, with regard to updating map data, a technique has been disclosed in which a user terminal device acquires a difference between new map data and old map data from a center, and updates the old map data with new map data (for example, the following patents) Reference 1).

JP 2004-287705 A

  In the above-described conventional technique, if the difference update is continuously continued with respect to the original map data stored and held in the terminal device, the difference amount becomes too large, and the processing time for performing the difference update becomes long. There was a thing. In addition, for users who do not frequently perform difference update, the difference data that needs to be updated accumulates, and the size of the difference data when updating exceeds the size of the original map data. An example is the problem that cannot be performed.

  In order to solve the above-described problems and achieve the object, the transmission device according to the invention of claim 1 has been changed as acquisition means for acquiring version information of map data and update data of the map from the terminal device. Recording means for recording first update data for updating road data that has not changed in addition to roads, second update data for updating data of roads that have changed, the version information, and the update data And determining means for determining one of the first update data and the second update data by comparing the version information corresponding to the information, and a transmission means for transmitting the determined update data. It is characterized by.

  Further, the terminal device according to the invention of claim 4 notifies the server of the version information of the map data at the time of updating the map data, and the update data downloaded from the server is added to the changed road, In the case of the first update data that also updates the road data that has not changed, the first update data is used to update the data by file update, and the update data downloaded from the server has changed. In the case of the second update data for updating the data, binary difference data update is performed using the second update data.

  According to a sixth aspect of the present invention, there is provided a transmission method carried out by a transmission device, wherein an acquisition step of acquiring version information of map data from a terminal device and a road that has been changed as map update data. In addition, a recording step of recording in the recording unit first update data for updating road data that has not changed, and second update data for updating data of the road that has changed, the version information, and the update A determination step of determining either the first update data or the second update data by comparing version information corresponding to the data; and a transmission step of transmitting the determined update data It is characterized by that.

  According to a seventh aspect of the present invention, a transmission program causes a computer to execute the transmission method according to the sixth aspect.

FIG. 1 is a block diagram of an example of a functional configuration of the transmission apparatus according to the embodiment. FIG. 2 is a flowchart illustrating an example of a processing procedure of the transmission apparatus according to the embodiment. FIG. 3 is a block diagram illustrating an example of a hardware configuration of the navigation device according to the embodiment of the transmission device. FIG. 4 is a diagram illustrating an example of map data held by the server according to the embodiment. FIG. 5 is a flowchart illustrating an example of update processing of map data according to the embodiment. FIG. 6 is a diagram illustrating an example of updating map data according to the embodiment. (Part 1) FIG. 7 is a schematic diagram illustrating an example of updating map data according to the embodiment. (Part 2)

(Embodiment)
Exemplary embodiments of a transmission device, a terminal device, a transmission method, and a transmission program according to the present invention are explained in detail below with reference to the accompanying drawings.

  FIG. 1 is a block diagram of an example of a functional configuration of the transmission apparatus according to the embodiment. The transmission device 100 is, for example, a server connected to an external terminal device via a network or the like. The terminal device stores and holds map data, and the transmission device 100 determines map data necessary for updating for the terminal device and transmits the map data to the terminal device.

  The transmission apparatus 100 includes an acquisition unit 101, a recording unit 102, a determination unit 103, and a transmission unit 104.

  The acquisition unit 101 acquires version information of map data held by the terminal device from the terminal device. For example, the acquisition unit 101 acquires version information of map data from the terminal device when there is a map data update request from the terminal device.

  The recording unit 102 stores and holds map data that changes over time in an updatable manner. The map data is, for example, a communication connection with an external device externally connected to the transmission device, a connector connection of a recording medium such as a memory (USB memory) in which update data is recorded, or an operation unit by an operator or the like. It is updated by an operation input or the like.

  The recording unit 102 records and holds the first update data and the second update data as the latest update data. The first update data is data obtained by updating road data that has not been changed in addition to the road that has been changed. For example, it corresponds to the data content when the map data is completely updated. The second update data is data for updating road data that has changed. The first update data and the second update data are both the latest update data. By using the first update data or the second update data, the map data of the terminal device becomes the latest map data. As will be described later, either the first update data or the second update data is transmitted to the terminal device according to the version information of the map data of the terminal device.

  The first update data and the second update data, which are the latest update data, hold the same version information. This version information includes first version information called a generation version that is counted up by a first update described later, and second version information called a monthly version that is counted up by a second update described later. Specifically, the version information is represented by a numerical value such as “1.0”, for example, the first version information before the decimal point and the second version information after the decimal point. When there is a first update to be described later, the first version information is counted up to “2.0”. Thereafter, when there is a second update described later, the second version information is counted up to “2.1”.

  The recording unit 102 periodically updates and stores the first update data and the second update data. The first update data is, for example, large data that is updated once every six months and has a large amount of difference data. Furthermore, the recording part 102 records the 1st update data containing the update of the monthly map data mentioned later for every month.

  The recording unit 102 updates (first update) the first update data in addition to roads that have changed since the previous update, including data on roads that have not changed (data for previous update). When this first update occurs, the value (version number) of the first version information (generation version) is counted up.

  The second update data is, for example, small data that is updated every month and has a small difference data amount.

  The recording unit 102 counts up the value (version number) of the second version information (monthly version) when the second update for updating the road data that has changed occurs in the second update data.

  The determination unit 103 compares the version information of the map data of the terminal device acquired by the acquisition unit 101 with the version information corresponding to the update data recorded by the recording unit 102. Then, it is determined whether the update data to be transmitted to the terminal is the first update data or the second update data.

  Here, the acquisition unit 101 acquires at least first version information from the terminal device as the version information of the map data of the terminal device when a request for updating the map data is received from the terminal device. Output to.

  Then, the determination unit 103 compares the current first version information (generation version) of the terminal device with the latest first version information recorded and held by the recording unit 102 of the transmission device 100.

  Then, as a result of the comparison, if the first version information of the latest map data of the transmission device 100 has a larger value than the current first version information of the terminal device, the determination unit 103 updates the first update data. Determine as data.

  On the other hand, the current first version information of the terminal device and the value of the first version information of the latest map data of the transmission device 100 are the same, and the latest version information of the transmission device 100 is higher than the current second version information of the terminal device. If the value of the second version of the map data is larger, the second update data is determined as update data.

  The transmission unit 104 transmits the update data (first update data or second update data) determined by the determination unit 103 to the terminal device.

  FIG. 2 is a flowchart illustrating an example of a processing procedure of the transmission apparatus according to the embodiment. In the transmission device 100, first, the acquisition unit 101 acquires the version information of the map data held by the terminal device from the terminal device (step S201). The acquisition timing is performed, for example, when there is a map data update request from the terminal device. At this time, the acquisition unit 101 acquires at least first version information from the terminal device as version information of the map data recorded in the terminal device.

  Next, the transmission device 100 compares the version information of the map data of the terminal device with the version information corresponding to the update data recorded by the recording unit 102 of the transmission device 100 by the determination unit 103 (step S202). . At this time, the determination unit 103 compares the current first version information (generation version) value of the terminal device with the latest first version information value recorded and held by the recording unit 102 of the transmission device 100. .

  And as a result of the comparison, when the first version information of the latest map data of the transmission device 100 has a larger value than the current first version information of the terminal device, the determination unit 103 determines that the value is larger (step S203: Yes). The first update data at the current time is determined as update data (step S204).

  On the other hand, the current first version information of the terminal device and the value of the first version information of the latest map data of the transmission device 100 are the same, and the latest version information of the transmission device 100 is higher than the current second version information of the terminal device. If the value of the second version of the map data is larger (step S203: No), the current second update data is determined as update data (step S205).

  Then, the transmission part 104 transmits the update data (1st update data or 2nd update data) which the determination part 103 determined to a terminal device (step S206), and complete | finishes a process.

  According to the embodiment described above, the transmission device acquires the current version information of the terminal device, and automatically changes the update method and the update data format according to the difference amount of data necessary for the terminal device. This makes it possible to perform differential update with an update method and update data size that are optimal for the terminal device. In addition, by using version operation to determine the update method and update data format, it is possible to update optimally by only obtaining the version of the terminal device without always managing the difference amount of the terminal device on the transmission device side. The method and update data format can be determined.

  As a result, the terminal device can update the data with the optimum data amount, and at the same time, the update data to be transmitted from the transmission device to the terminal device can be minimized. In any of the data transmission apparatuses, data update can be performed efficiently and the data processing load and communication load can be minimized.

  Next, examples of the present invention will be described. In the embodiment, the navigation device 300 is mounted on the user's vehicle and is connected to the server by communication. The navigation device 300 records and holds map data in an updatable manner, makes an acquisition request to the server at the time of updating, and downloads the map data from the server. An example in which the server executes the function of the transmission device 100 and the navigation device 300 executes the function of the terminal device will be described.

(Hardware configuration of navigation device 300)
FIG. 3 is a block diagram illustrating an example of a hardware configuration of the navigation device according to the embodiment of the transmission device. In FIG. 3, a navigation device 300 includes a CPU 301, ROM 302, RAM 303, magnetic disk drive 304, magnetic disk 305, optical disk drive 306, optical disk 307, audio I / F (interface) 308, microphone 309, speaker 310, input device 311, A video I / F 312, a display 313, a communication I / F 314, a GPS unit 315, various sensors 316, and a camera 317 are provided. Each component 301 to 317 is connected by a bus 320.

  The CPU 301 governs overall control of the navigation device 300. The ROM 302 records a boot program and a shooting program. The RAM 303 is used as a work area for the CPU 301. That is, the CPU 301 controls the entire navigation device 300 by executing various programs recorded in the ROM 302 while using the RAM 303 as a work area.

  The magnetic disk drive 304 controls the reading / writing of the data with respect to the magnetic disk 305 according to control of CPU301. The magnetic disk 305 records data written under the control of the magnetic disk drive 304. As the magnetic disk 305, for example, an HD (hard disk) or an FD (flexible disk) can be used.

  The optical disk drive 306 controls reading / writing of data with respect to the optical disk 307 according to the control of the CPU 301. The optical disk 307 is a detachable recording medium from which data is read according to the control of the optical disk drive 306. As the optical disc 307, a writable recording medium can be used. In addition to the optical disk 307, an MO, a memory card, or the like can be used as a removable recording medium.

  Examples of information recorded on the magnetic disk 305 and the optical disk 307 include map data, vehicle information, road information, travel history, and the like. Map data is used when searching for routes in car navigation systems. Background data that represents features (features) such as buildings, rivers, ground surfaces, and energy supply facilities, and road shapes that represent road shapes with links and nodes. It is vector data including data.

  The map data also includes version information. This version information is version information composed of the above-described first version information (generation version) and second version information (monthly version).

  The audio I / F 308 is connected to a microphone 309 for audio input and a speaker 310 for audio output. The sound received by the microphone 309 is A / D converted in the sound I / F 308. For example, the microphone 309 is installed in a dashboard portion of a vehicle, and the number thereof may be one or more. From the speaker 310, a sound obtained by D / A converting a predetermined sound signal in the sound I / F 308 is output.

  Examples of the input device 311 include a remote controller having a plurality of keys for inputting characters, numerical values, various instructions, and the like, a keyboard, and a touch panel. The input device 311 may be realized by any one form of a remote control, a keyboard, and a touch panel, but may be realized by a plurality of forms.

  The video I / F 312 is connected to the display 313. Specifically, the video I / F 312 is output from, for example, a graphic controller that controls the entire display 313, a buffer memory such as a VRAM (Video RAM) that temporarily records image information that can be displayed immediately, and a graphic controller. And a control IC for controlling the display 313 based on the image data to be processed.

  The display 313 displays icons, cursors, menus, windows, or various data such as characters and images. As the display 313, for example, a TFT liquid crystal display, an organic EL display, or the like can be used.

  The camera 317 captures an image including a road outside the vehicle. The image may be either a still image or a moving image. For example, the outside of the vehicle is photographed by the camera 317, and the photographed image is analyzed by the CPU 301, or a recording medium such as the magnetic disk 305 or the optical disk 307 via the video I / F 312 Or output to

  The communication I / F 314 is connected to a network via wireless and functions as an interface between the navigation device 300 and the CPU 301. Communication networks that function as networks include in-vehicle communication networks such as CAN and LIN (Local Interconnect Network), public line networks and mobile phone networks, DSRC (Dedicated Short Range Communication), LAN, and WAN. The communication I / F 314 is, for example, a public line connection module, an ETC (non-stop automatic fee payment system, registered trademark) unit, an FM tuner, a VICS (registered trademark) / beacon receiver, or the like.

  Using this communication I / F 314, communication with a server described later is performed, and the version information of the map data recorded on the magnetic disk 305 and the optical disk 307 is transmitted to the server.

  The GPS unit 315 receives radio waves from GPS satellites and outputs information indicating the current position of the vehicle. The output information of the GPS unit 315 is used when the CPU 301 calculates the current position of the vehicle together with output values of various sensors 316 described later. The information indicating the current position is information for specifying one point on the map data such as latitude / longitude and altitude.

  The various sensors 316 output information for determining the position and behavior of the vehicle, such as a vehicle speed sensor, an acceleration sensor, an angular velocity sensor, and a tilt sensor. The output values of the various sensors 316 are used for the calculation of the current position of the vehicle by the CPU 301 and the amount of change in speed and direction.

(Server configuration example)
The server used as the transmission device described in FIG. 1 also has the same configuration as that in FIG. In this server, the GPS unit 315, the various sensors 316, the camera 317, etc. shown in FIG. 3 are unnecessary. The transmission apparatus 100 shown in FIG. 1 uses the programs and data recorded in the ROM 302, RAM 303, magnetic disk 305, optical disk 307, etc. shown in FIG. The function of the determination unit 103 is realized. Further, the functions of the acquisition unit 101 and the transmission unit 104 in FIG. 1 can be realized using the communication I / F 314 in FIG. 3. Further, the function of the recording unit 102 in FIG. 1 can be realized by using the magnetic disk 305 and the optical disk 307 in FIG.

(About map data used for updating)
FIG. 4 is a diagram illustrating an example of map data held by the server according to the embodiment. Next, a management state of map update data held by the server which is the transmission apparatus 100 will be described. FIG. 4 shows the first update data V1 and the second update data V2 described above.

  For example, the first update data V1 is updated every six months (the next of November 2016 is May 2017), and the content of the map data is significantly changed compared to the first update data V1 at the time of the previous update. The Furthermore, in the example shown in the figure, the first update data V1 is updated every two months to include the update every two months. In the example shown in the figure, the second update data V2 is updated every two months (the next update in July 2016 is updated in September 2016). The content of the map data is changed as compared to the first update data V1. Small (less).

  As shown in the figure, the server holds both the first update data V1 and the second update data V2 every odd month so as to be provided to the terminal device (navigation device 300).

  In FIG. 4, “large” indicates that the difference is large, and “small” indicates that the difference is small. The “small” update data holds the difference from the previous update data, that is, the difference data of the portion changed compared to the previous update data as a binary difference (the data amount is, for example, 100 MByte). The update data of “Large” is held in file units including all data from the time of shipment of map data as a product (the data amount is, for example, 2 Gbytes).

  In the example of FIG. 4, for example, when the user of the navigation device 300 updates the data in September 2016 with respect to the map data recorded and held by the navigation device 300 released in May 2016. Will be described. In this case, the determination unit 103 (CPU 301) of the server determines that the amount of data change is small compared to the previous data (at the time of purchase), and the difference between July and September 2016 is “small”. The second update data V2 is downloaded to the navigation device 300, and the map data in the navigation device 300 is updated.

  Similarly, when a user who purchased in May 2016 updates the data in September 2017, the server determines that the amount of data change will increase, and the difference “large” in September 2017 The first update data V1 is downloaded to the navigation device 300. As described above, the server determines whether the necessary update data is the first update data V1 or the second update data V2 in accordance with the amount of change of the data necessary when the navigation device 300 is updated. Data is downloaded to the navigation device 300.

  In this way, the server switches to updating using the “large” file according to the update time in order to prevent the update time from becoming longer if the update count of the “small” binary difference becomes too large. In particular, the data update time is shortened.

As described above, the reason why the first update data V1 having the difference “large” is performed once every six months is, for example, for the following reason.
1. The existing road link ID is changed in order to match the consistency with the added road link ID.
2. Because a large amount of original data is maintained once every six months, various IDs after editing change before and after the maintenance. For example, when one road is added, the existing road link ID is also changed in order to maintain the consistency. Moreover, it is necessary to take consistency of various data linked to the existing road link ID by changing the existing road link ID.

(Map data update processing example)
FIG. 5 is a flowchart illustrating an example of update processing of map data according to the embodiment. In the following process, steps S501 to S506 are processes performed by the server, and steps S507 to S512 are processes performed by the navigation apparatus 300. In both the server and the navigation device 300, the CPU executes the following processing.

  First, the navigation device (referred to as a navigation) 300 uploads (uploads) the version information of the current map data to the server when the map data is updated (step S501). At this time, the navigation 300 notifies the server of version information including first version information (generation version) and second version information (monthly version).

  Then, the server compares the version information of the data (update data) currently held by the server with the version information of the data of the navigation 300 (step S502). At this time, at least the server compares the first version information (generation version).

  Next, the server determines whether the first version information (generation version) of the data (update data) held by the server is larger (newer) than the first version information (generation version) of the navigation 300 (step S503). ). When the first version information (generation version) of the server is larger than the first version information (generation version) of the data of the navigation 300 (step S503: Yes), the server sends the data having the difference “large” to the navigation 300. Download (step S504), the process proceeds to step S507.

  On the other hand, when the first version information (generation version) of the server is equal to or smaller (older) than the first version information (generation version) of the navigation 300 (step S503: No), the server uses the first version information ( It is determined whether the generation version is equal to the first version information (generation version) of the navigation 300 and the second version information (monthly version) of the server is greater than the second version information (monthly version) of the navigation 300 (step S505). ).

  Here, the first version information (generation version) of the server is equal to the first version information (generation version) of the navigation 300, and the second version information (monthly version) of the server is the second version information (monthly version) of the navigation 300. ) (Step S505: Yes), the server downloads the difference “small” data to the navigation 300 (step S506), and proceeds to step S507.

  On the other hand, the first version information (generation version) of the server is equal to the first version information (generation version) of the navigation 300, and the second version information (monthly version) of the server is smaller than the second version information (monthly version) of the navigation 300. In such a case (step S505: No), the process proceeds to step S512 without downloading data to the navigation 300.

  In step S507, the navigation 300 compares the current map data version on the navigation side with the downloaded update data version (step S507). Thereafter, when the downloaded generation version is larger than the version of the navigation 300 (step S508: Yes), the navigation 300 transmits the downloaded update data (first update data V1, generation version) file to the navigation 300. The file is replaced (step S509), and the process is terminated.

  On the other hand, when the downloaded first version information (generation version) is equal to or smaller than the first version information (generation version) of the navigation 300 (step S508: No), the navigation 300 proceeds to step S510.

  In step S510, the navigation 300 has the downloaded data and the first version information (generation version) of the current map data of the navigation 300 equal to each other, and the second version information (monthly version) of the downloaded update data is the same. It is determined whether it is larger than the current second version information (monthly version) of the navigation 300 (step S510). The downloaded data and the first version information (generation version) of the current map data of the navigation 300 are equal, and the second version information (monthly version) of the downloaded update data is the current second version of the navigation 300. If it is larger than the information (monthly version) (step S510: Yes), the navigation 300 uses the downloaded update data (second update data V2) to perform binary difference update on the current map data (step S511). .

  The first version information (generation version) of the data downloaded in step S510 and the current map data of the navigation 300 are equal to each other, and the second version information (monthly version) of the downloaded update data is the current first version information of the navigation 300. If the version information is smaller than the two version information (monthly version) (step S510: No), the update is not performed because there is no target difference data (update data) for the current map data (step S512).

  As shown in the above process, the data and the update method are changed according to the amount of data change from the previous update at the time of map data update. In the case of “small”, it is possible to update data efficiently in accordance with the amount of data at the time of update by performing binary difference update. However, the update data and update method are not limited to the file update and binary difference update.

(Map data update example)
6 and 7 are diagrams illustrating examples of updating map data according to the embodiment. First, map data update example 1 (case 1) will be described with reference to FIG. In this update example 1, a case will be described in which the user of the navigation device 300 updates the data in September 2016 for the map data recorded and held by the navigation device 300 released in May 2016.

  In this case, the determination unit 103 (CPU 301) of the server determines that the amount of data change is small compared to the previous data (at the time of purchase), and the difference between July and September 2016 is “small”. The second update data V2 is downloaded to the navigation device 300, and the map data in the navigation device 300 is updated.

  Then, the navigation apparatus 300 updates the data with a binary difference based on the second update data V2 with a difference “small” in July 2016, and then performs a binary update with the second update data V2 with a difference “small” in September 2016. Update data with the difference.

  Next, map data update example 2 (case 2) will be described with reference to FIG. In this update example 2, a case will be described in which the user of the navigation device 300 updates the data in September 2017 for the map data recorded and held by the navigation device 300 released in May 2016.

  In this case, the determination unit 103 (CPU 301) of the server determines that the data change amount is larger than the previous data (at the time of purchase), and the first update of the difference “large” in September 2017. The data V1 is downloaded to the navigation device 300, and the map data in the navigation device 300 is updated.

  Then, the navigation apparatus 300 performs data update by file update based on the first update data V1 of the difference “large” in September 2017.

  The difference data “Large” for September 2017 includes the difference data “Small” for July 2017 and the difference data “Small” for September 2017. "Is reflected in the data.

  Such difference data “Large” is maintained every time the map data is updated in the server. Then, as in update example 2 in FIG. 7, the user who has not performed the map update for a long time (the navigation device 300 can also update the map data by one update operation.

  By downloading the difference data “Large” in September 2017 or the difference data “Small” in September 2017, the map data used by the user becomes the same, so the same version information is given to each. .

  According to the embodiment described above, the server acquires version information of the current map data of the navigation device, and whether the data necessary for updating the map data of the navigation device is the first update data having a large difference amount, Alternatively, it is determined whether the second update data has a small amount of difference data. As a result, the server can transmit (download) update data corresponding to the difference data amount necessary for the navigation device to the navigation device.

  As a result, the navigation device does not need to continue to perform the difference update permanently for the original map data to be stored and held, for example, the difference amount increases as time elapses from the previous update time. Longer time can be prevented. In this way, if the difference data that needs to be updated accumulates for users with a low frequency of performing the difference update, the size of the difference data when updating may exceed the size of the original map data. According to the embodiment, when time elapses, the file is updated using the first update data having a large difference amount, so that the map data can be updated efficiently.

  In the embodiment, the navigation device is used as the terminal device for updating the map data. However, the present invention can be similarly applied to a terminal device such as a smartphone or a tablet that holds the map data.

  The transmission method described in this embodiment can be realized by executing a program prepared in advance on a computer such as a personal computer or a workstation. This program is recorded on a computer-readable recording medium such as a hard disk, a flexible disk, a CD-ROM, an MO, and a DVD, and is executed by being read from the recording medium by the computer. The program may be a transmission medium that can be distributed via a network such as the Internet.

DESCRIPTION OF SYMBOLS 100 Transmission apparatus 101 Acquisition part 102 Recording part 103 Determination part 104 Transmission part 300 Navigation apparatus

Claims (7)

Acquisition means for acquiring version information of map data from a terminal device;
Recording means for recording, as map update data, first update data for updating road data that has not changed in addition to changed road data and second update data for updating road data that has changed When,
Determining means for determining either the first update data or the second update data by comparing the version information with version information corresponding to the update data;
Transmitting means for transmitting the determined update data;
A transmission device comprising: The recording means, as version information of the update data, is a first version information that is a number that is counted up when a first update occurs in which data of a road that has not changed is updated in addition to a road that has changed When,
2. The transmission according to claim 1, wherein version information is recorded including second version information that is a number counted up when a second update for updating data of a road that has changed occurs. apparatus.   The determining means compares the first version information acquired by the acquiring means with the first version information of the latest map data, and if the first version information of the latest map data is larger, 1 update data is determined as update data, the first version information is the same, and the second version information acquired by the acquisition means is compared with the second version information of the latest map data, The transmission apparatus according to claim 2, wherein when the latest second version information is larger, the second update data is determined as update data. Notifying the server of the version information of the map data when updating the map data,
If the update data downloaded from the server is the first update data that updates the road data that has not changed in addition to the road that has changed, data update by file update using the first update data And
If the update data downloaded from the server is second update data for updating road data that has changed, the terminal performs binary difference data update using the second update data apparatus.   The first version is a number that is counted up when a first update that updates the road data that has not changed as well as the road that has changed as the version information to the server when the map data is updated The terminal device according to claim 4, wherein at least information is notified. In the transmission method performed by the transmission device,
An acquisition process for acquiring map data version information from the terminal device;
As update data of the map, the first update data for updating the data of the road that has not changed in addition to the changed road and the second update data for updating the data of the road having the change are recorded in the recording unit. Recording process to
A determination step of determining either the first update data or the second update data by comparing the version information and version information corresponding to the update data;
A transmission step of transmitting the determined update data;
The transmission method characterized by including.   A transmission program for causing a computer to execute the transmission method according to claim 6.

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