Map updating method, map updating server and vehicle terminal

Abstract

The present invention relates to a map updating method, a map updating server and an in-vehicle terminal. The map updating server includes a server-side update management unit that responds to the confirmation result by instructing to temporarily use the update data and distributing the update data when receiving a request confirmation in a state where there is update data after a temporary road change is started, and responds to the confirmation result by instructing to use the update data before the temporary road change is started when receiving a request confirmation in a state where there is update data after a temporary road change is ended, and the in-vehicle terminal includes an in-vehicle terminal-side update management unit that responds to the confirmation result by instructing to use the distributed update data when the update data is indicated to be temporarily used as a confirmation result from the map updating server, and by using the map data before the temporary road change is started instead of the update data when the update data is indicated to be used as a confirmation result.

Description

Technical Field

[0001] The present disclosure relates to a map updating method, a map updating server and a vehicle-mounted terminal. Background Art

[0002] Conventionally, there is a method in which a map update server detects a change in a road and updates the map data of an in-vehicle terminal by comparing and statistically processing road data and the trajectories of vehicles traveling on the road (see Patent Document 1).

[0003] Patent Document 1: Japanese Patent No. 6302848

[0004] In the technology of Patent Document 1, since the map update server updates and distributes map data every time a change in road conditions (hereinafter referred to as road change) is detected, it can be expected that map data can be updated quickly.

[0005] However, in a state where a temporary road change occurs, such as a road repair project, and the road is restored to the original road after the change, there are two road changes (after the project starts and after the project ends), so the map data is updated / distributed twice before the temporary road change ends. Therefore, when the vehicle-mounted terminal temporarily uses the map data updated for the temporary road change, the same map data as the original road is distributed in vain after the project ends, and the data communication volume increases accordingly. Summary of the invention

[0006] The present disclosure provides a map updating method, a map updating server, and a vehicle-mounted terminal, which are capable of reducing the amount of data communication between a vehicle-mounted terminal and a map updating server when a temporary road change occurs.

[0007] In one aspect of the present disclosure, when receiving a request confirmation from the vehicle-mounted terminal in a state where update data after a temporary road change is started, the map update server responds to the confirmation result by instructing temporary use of the update data and distributing the update data.

[0008] The in-vehicle terminal utilizes the distributed update data when being instructed to temporarily utilize the update data as a result of the confirmation by the map updating server.

[0009] When receiving a request confirmation from the in-vehicle terminal in a state where update data after the temporary road change is completed exists, the map updating server responds to the confirmation result by instructing to use update data before the temporary road change is started.

[0010] When the use of the update data before the temporary road change is instructed as a result of the confirmation, the in-vehicle terminal temporarily uses the update data by using the map data before the temporary road change is started instead of the update data.

[0011] As a result of the above-described operation, when the in-vehicle terminal temporarily uses the update data, data communication between the in-vehicle terminal and the map update server can be suppressed, thereby reducing the amount of data communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above-mentioned objects and other objects, features and advantages of the present disclosure will become more apparent through the following detailed description with reference to the accompanying drawings. In these drawings:

[0013] Figure 1 is a functional block diagram showing a map updating system in one embodiment.

[0014] Figure 2 is a flowchart schematically showing the communication operation between the car navigation system and the server.

[0015] Figure 3 This is a flowchart showing the server's preliminary preparation actions.

[0016] Figure 4 This is a flowchart showing the map update and management actions of the server.

[0017] Figure 5 This is a flowchart showing the preliminary preparations for car navigation.

[0018] Figure 6 is a flowchart showing the map update processing operation of the car navigation.

[0019] Figure 7 is a flowchart showing the car navigation corresponding processing operation of the server,

[0020] Figure 8 This is a diagram showing the operation of the car navigation system and the server in association with each other. DETAILED DESCRIPTION

[0021] Hereinafter, one embodiment will be described with reference to the drawings.

[0022] like Figure 1 As shown, the map update system is composed of a car navigation system (hereinafter referred to as the car navigation system. It is equivalent to a vehicle-mounted terminal) 1 installed in a vehicle and a map update server (hereinafter referred to as the server. It is equivalent to a server) 2 installed in an information center. The car navigation system 1 is configured to include: a position detection device 3, a storage device 4, a display device 5, a sound output device 6, an operation switch group 7, a wireless communication device 8, an external device I / F 9, and a control device 10.

[0023] The position detection device 3 is composed of a geomagnetic sensor 11, a gyroscope 12, a vehicle speed sensor 13, and a GPS (Global Positioning System) receiver 14, and detects the current position of the vehicle one by one based on the detection signals from these multiple devices 11 to 14. The position detection device 3 does not need to be composed of all the multiple devices 11 to 14, and can also be composed of a part of the devices. The storage device 4 is a storage device that can be read and written, such as a hard disk drive, and has a map data storage unit 4a and a reserved map data storage unit 4b. The storage device 4 can also be configured to be removable, such as an SD memory card.

[0024] The display device 5 is, for example, a device capable of full-color display, and can be composed of a liquid crystal display, an organic EL display, a plasma display, etc. The sound output device 6 is composed of a speaker, etc., and outputs a guidance sound, etc. based on the instruction of the control device 10. The operation switch group 7 is composed of, for example, a touch panel, a mechanical switch, etc. integrated with the display device 5, and outputs a switch signal corresponding to the user's switch operation to the control device 10.

[0025] The wireless communication device 8 has a function of communicating with the server 2 via a public line network 15 such as a mobile phone network and the Internet. The wireless communication device 8 may be constituted by, for example, a vehicle-mounted communication module for telematics communication such as a DCM (data communication module) mounted on a vehicle, or may be constituted by a DSRC (Dedicated Short Range Communications) communication module. In addition, the wireless communication device 8 may be constituted by a Bluetooth (registered trademark) communication module, or may be constituted so as to communicate with the server 2 via a mobile terminal (mobile phone, smartphone, etc.) connected by Bluetooth communication.

[0026] The external device I / F 9 is constituted by an I / F for connecting to an external computer or the like using a USB (Universal Serial Bus) etc. The server 2 may be communicated with by wireless communication via the external device I / F 9 and the external computer.

[0027] The control device 10 is mainly composed of a microcomputer composed of a CPU, ROM, RAM, backup RAM, etc., and has the functions of an update management unit 10a (equivalent to the update management unit on the vehicle terminal side) and an acquisition unit 10b. The control device 10 performs map display processing, route search processing, route guidance processing, etc. as a navigation function based on various information input from the position detection device 3, the storage device 4, the operation switch group 7, the wireless communication device 8, and the external device I / F 9.

[0028] When updating the map data stored in the map data storage unit 4a of the storage device 4 to the latest map data, i.e., update data, the control device 10 communicates with the server 2 via the wireless communication device 8 or the external device I / F 9 to transmit and receive information for updating the map data. That is, by making an update request to the server 2 to download the update data, the corresponding map data stored in the map data storage unit 4a of the storage device 4 is updated.

[0029] The server 2 is composed of a display device 16, a communication device 17, a storage device 18, and a control device 19, and is connected to the public line network 15 via the communication device 17. The storage device 18 is configured to include a map data storage unit 18a and a reserved map data storage unit 18b.

[0030] The control device 19 is mainly composed of a microcomputer composed of a CPU, ROM, RAM, backup RAM, etc., and has the function of an update management unit 19a (equivalent to a server-side update management unit). The control device 19 collects detection information composed of image data and position data captured by multiple detection vehicles via the public line network 15, and creates the latest map data, that is, update data, when it is determined that the map data has changed based on the collected detection information.

[0031] When there is a request confirmation for update data from the car navigation system 1, the server 2 responds with the corresponding update data as the confirmation result. The response here refers to the distribution of update data or the instruction of data processing of the vehicle-mounted device. Therefore, even if there is a road change, the car navigation system 1 can obtain the update data corresponding to the road change from the server 2 to perform route search processing, so that various navigation functions corresponding to the road change can be provided to the user.

[0032] The so-called road change is a situation where the server 2 determines that a road change has occurred that affects the driving of the vehicle based on the detection information collected from multiple detection vehicles. The so-called situation where a road change has occurred mainly assumes a detour road, but it means all changes that affect the driving path of the vehicle, such as changes in restriction information such as no-passing and changes in driving lanes. It is not limited to detection information, and the latest map data can also be obtained from the map data creator.

[0033] However, when the vehicle is traveling in a section where a temporary road change occurs, for example, navigation (driving / guidance / route search, etc.) can be performed based on the updated data to avoid the influence of the road change.

[0034] However, when the road environment returns to the same state as before the road change after a temporary road change, the same updated map data as the original map data is received and used from the server 2, so the data communication volume between the car navigation system 1 and the server 2 is wasted.

[0035] In view of such a situation, in the present embodiment, the amount of data communication between the car navigation system 1 and the server 2 is reduced during a temporary road change as follows.

[0036] First, the basic operation between the car navigation system 1 and the server 2 will be described.

[0037] like Figure 2 As shown, when there is a road change (S11: Yes), the server 2 determines the state (S12).

[0038] The car navigation system 1 requests the server 2 to confirm the update data according to the vehicle's movement. When the server 2 receives the confirmation request from the car navigation system 1 (S31: Yes), it responds with the confirmation result to the car navigation system 1 based on the current state (S32). When the car navigation system 1 receives the confirmation result from the server 2 (S22: Yes), it executes the map data update process according to the confirmation result (S23).

[0039] As described above, it is possible to provide the user with a navigation function corresponding to a road change.

[0040] In order to specifically Figure 2 The operation shown will be described below, and as an example, a case where a vehicle temporarily travels on a detour road as part of a road repair project will be described.

[0041] like Figure 3 As shown in FIG. 1 , as a preliminary preparation, the server 2 sets the change management information = "invalid" (S101). Figure 5 As shown, as a preliminary preparation, the car navigation system 1 sets the hold information = OFF (S301).

[0042] 1. Regarding the operation of the car navigation system 1 that needs to reflect changes in normal road conditions

[0043] (1) When change management information = "invalid"

[0044] like Figure 4As shown, the server 2 collects information such as the location and period of the road construction (hereinafter referred to as road change information) (S201), determines whether there is a road change based on the detection information (S202), and when it is determined that there is a road change (S202: "Yes"), determines the change management information (S203). At this time, since the change management information = "invalid" (S203: "Yes"), the map data stored in the map data storage unit 18a of the storage device 18 is updated to the latest map data (S204).

[0045] As described above, update data is created every time there is a road change.

[0046] Then, when the user sets the destination, such as Figure 6 As shown, the car navigation system 1 sets a guidance route and provides it to the user (S401). The user drives the vehicle according to the guidance route provided by the car navigation system 1. The car navigation system 1 sends a request confirmation for updating data according to the vehicle driving (S402). At this time, the map version of the car navigation system 1 is attached and sent.

[0047] like Figure 7 As shown, when the server 2 receives a request confirmation for updating data from the car navigation system 1 (S501: Yes), it determines the change management information (S502). At this time, since the change management information = "invalid" (S502: Yes), it confirms the map version of itself and the received car navigation system 1 (S503). When the map versions of both parties are the same (S504: Yes), since it is not necessary to update the map data, after setting the response type = "no update" (S509), it responds with the response type (S507).

[0048] When receiving the response type = "no update" (S404: Yes), the car navigation system 1 does not perform any operation.

[0049] On the other hand, if the versions of the two map data are different (S504: No), the server 2 sets the latest map data (S505), sets the response type = "map update" (S506), and transmits the response type and map data (S507).

[0050] When the car navigation system 1 receives the response type = "map update" (S405: "Yes"), it updates the received map data (S406) and determines whether the hold information is ON (S407). At this time, since the hold information = OFF (S407: "No"), no operation is performed. In addition, when the hold information = ON (S407: "Yes"), the hold information is set to OFF (S408). The hold information is information indicating that the map data is held.

[0051] 2. Regarding the operation of car navigation system 1 that needs to reflect the changes in road conditions during the construction period

[0052] Then, Server 2 Figure 3 In the above-mentioned preparation, when the change management information is set to "invalid", it is determined whether the project information is obtained from the government gazette, county gazette, Internet homepage, etc. (S102). When the project information is obtained (S102: "Yes"), the change management information is set to "prepare" (S103).

[0053] As described above, the preliminary preparations are completed.

[0054] (2) When change management information = "prepare"

[0055] When receiving the request confirmation for updating data from the car navigation system 1 (S501: YES), the server 2 sets the response type to "no update" (S509) because the change management information = "prepare" (S508: YES), and then transmits the response type (S507).

[0056] Since the car navigation system 1 receives the response type = "no update" (S404: Yes), it does not perform any operation.

[0057] As described above, when the change management information = "prepare", the map data of the car navigation 1 is not updated.

[0058] When the server 2 determines that a road change has occurred by detecting that the vehicle is traveling on the detour road (S202: Yes), since the change management information = "prepare" (S205: Yes), the map data is reserved in the reserved map data storage unit 18b of the storage device 18 after the project starts (S206). The reserved map data is the map data before the project starts, and the map version is Ver.0. For the sake of simplicity, the map version is set to Ver.0, which is actually the actual map version at that time.

[0059] Next, after the map data is updated ( S207 ), the change management information is set to “hold” ( S208 ).

[0060] As described above, the map data before the start of the construction in the server 2 is retained, while the map data is updated to the map data after the start of the construction.

[0061] (3) When the change management information = "holding"

[0062] When there is a construction section on the searched route or when the vehicle approaches a construction section while traveling, the car navigation system 1 sends a request confirmation including update data of the construction section. When the server 2 receives the request confirmation of update data from the car navigation system 1 (S501: Yes), since the change management information = "reserved" (S510: Yes), the map data is set (S511). The map data is the map data after the construction started, and the map version is Ver.1. Next, after setting the response type = "map reserved" (S512), the response type and the map data are sent (S507).

[0063] When the car navigation system 1 receives a response from the server 2 (S403: Yes), the map data is retained (S410) because the response type = "map retention" (S409: Yes). The map data at this time is the map data before the project started, and the map version is Ver.0. Next, after setting the retention information = ON (S411), the map data is updated to the updated data (S412). The updated data is the map data after the project started, and the map version is Ver.1.

[0064] When the server 2 determines that a road change has occurred by detecting that the vehicle is traveling on the road before the road construction instead of the detour road (S202: "Yes"), since the change management information = "holding" (S209: "Yes"), it is set to be after the completion of the construction, and the map data is updated (S210). The map data at this time is the map data after the completion of the construction, and the map version is Ver.2.

[0065] Next, the map is compared with the remaining map (S211) to determine whether it is consistent (S212). The scope of determining the consistency of the map data can be considered as a road link unit, an area unit, etc. In the case of road changes after the completion of the project, there are cases where the road in the project section is restored to the state before the project started and cases where it is not restored to the state before the project started. In the case of restoration to the state before the project started, since the updated data is consistent with the remaining map data (S212: "Yes"), the change management information is set to "reusable" (S213).

[0066] On the other hand, if the road is different from that before the construction started, since the update data does not match the existing map (S212: No), the existing map data is discarded (S215), and the change management information is set to "invalid" (S216).

[0067] (4) When change management information = "reusable"

[0068] When receiving the request confirmation of updating data from the car navigation system 1 (S501: Yes), the server 2 sets the map version (S513) because the change management information = "reusable" (S510: No), and after setting the response type = "map reuse" (S514), sends the response type and the map version (S507). The map version at this time is Ver.2.

[0069] As described above, when the change management information = "reusable", only the map version is sent, and the map data is not sent. This is because the car navigation system 1 continues to use the remaining map data as follows.

[0070] When the car navigation system 1 receives a response from the server 2 (S403: Yes), since the response type = "map reuse" (S409: No), it checks whether the retention information = ON (S413). Since the retention information = ON (S413: Yes), the retained map data is restored (S414). The version of the retained map data at this time is Ver. 0.

[0071] Next, after updating to the received map version (S415), the retention information is set to OFF (S416). The map version at this time is the map version after the project is completed, which is Ver.2.

[0072] As described above, the car navigation system 1 can perform navigation using the restored retained map data.

[0073] When a road change occurs (S202: Yes), and when the change management information = "reusable" (S209: No), the server 2 updates the map data (S214). The map version at this time is Ver. 3. Next, after discarding the remaining map data (S215), the change management information is set to "invalid" (S216).

[0074] Thereafter, since the map data is updated every time the road changes, the car navigation 1 searches for a guidance route based on the update data received from the server 2 .

[0075] When the above-mentioned car navigation 1 and the server 2 are summarized, it can be as follows Figure 8 In addition, Figure 8 This shows a case where the update data after the completion of the construction is consistent with the reserved map data, that is, a case where the reserved information = ON.

[0076] 3. Regarding the operation of the car navigation system 1 that needs to reflect the changes in road conditions after the construction period (the map data of the car navigation system 1 was not updated during the construction period)

[0077] If the vehicle has not reached the construction section during the construction period and has reached it for the first time after the construction is completed, the car navigation system 1 does not retain the map data and receives a response type = "map reuse" from the server 2 (S409: No). Therefore, the above-mentioned retained map data does not exist.

[0078] Therefore, when the response type = "map reuse" (S409: "No"), when the retention information = OFF (S413: "No"), the car navigation system 1 does not restore the retained map data but updates the map version of its own map data (S415). The map version at this time is Ver.2. In this case, since the map data is maintained in the state before the project starts, the updated data is the same as that after the project is completed, so the car navigation system 1 can continue to use the map data before the project starts to search for the guidance route.

[0079] According to such an embodiment, the following effects can be achieved.

[0080] When there is a road change, the server 2 determines the change management information (status), and when the car navigation system 1 is requested to confirm the update data, the server 2 responds with the confirmation result based on the change management information, and the car navigation system 1 performs map data update processing according to the confirmation result from the server 2. Therefore, when it is determined that the map data is the same as before the road construction due to the completion of temporary road construction, the reserved map data retained before the road construction is restored and used. In this way, the data communication between the car navigation system 1 and the server 2 after the completion of the construction can be suppressed, so the data communication volume between the car navigation system 1 and the server 2 can be reduced.

[0081] When the response type = "map reuse" and the retention information = OFF, that is, when the vehicle did not pass through the construction section during the construction period and passed through it for the first time after the construction was completed, the car navigation 1 can use its own map data before the start of the construction as the latest map data instead of restoring the retained map data. Therefore, the data communication volume between the car navigation 1 and the server 2 can be reduced in the same way as the case of using the retained map data as described above.

[0082] The server 2 acquires detailed information of the construction section or construction period from the outside as construction information, thereby being able to appropriately determine the construction section or construction period and perform processing efficiently.

[0083] In the update of map data, in order to manage the freshness / update of map data, management is performed by assigning map versions and update dates in update units. However, when an instruction to reuse the retained map data on the car navigation 1 side or an instruction to use the existing map data as it is is received from the server 2, the map data on the car navigation 1 side remains in the old state and only the management information is updated to the latest information, so that integration with other management information can be maintained.

[0084] (Other Embodiments)

[0085] Map data may be updated by communication based on Wi-Fi or by using a medium such as USB, in addition to communication based on DCM.

[0086] The attributes for determining whether the map data are consistent are not limited to the shape of the road topography, but may also include features such as roadside signs in addition to road attributes such as the number of lanes and restrictions.

[0087] As a method of obtaining temporary road construction information, in addition to using government gazettes, county gazettes, and paper / Web information provided by road managers / construction managers, infrastructure information such as image recognition of construction signs using vehicle camera images, VICS (Vehicle Information and Communication System) (registered trademark), and DSRC (Dedicated Short Range Communications) can also be used.

[0088] The in-vehicle terminal is not limited to a car navigation system, and a smartphone, a tablet computer, or a personal computer may also be used.

[0089] It can also be applied to updating map data for autonomous driving.

[0090] The present disclosure is described in accordance with the implementation mode, but it should be understood that the present disclosure is not limited to the implementation mode and structure. The present disclosure also includes various modifications and modifications within the equivalent range. In addition, various combinations and methods, and other combinations and methods that only include one element, more or less in these combinations and methods also fall within the scope and scope of the present disclosure.

Claims

1. A map updating method, wherein a vehicle terminal requests a map updating server to confirm whether there is update data, and the map updating server responds with a confirmation result so as to update the map data of the vehicle terminal, wherein the update data is map data for updating, In the case where the request confirmation is received in a state where update data after the temporary road change has been started, the map update server responds to the confirmation result by instructing to temporarily use the update data and distribute the update data, and in the case where the request confirmation is received in a state where update data after the temporary road change has been ended, the map update server responds to the confirmation result by instructing to use the update data before the temporary road change has been started. The vehicle-mounted terminal temporarily uses the update data by using the distributed update data when the map update server is instructed to temporarily use the update data as a result of the confirmation, and by using the map data before the temporary road change starts instead of the update data when the map update server is instructed to use the update data before the temporary road change starts as a result of the confirmation, The above map update server obtains project information, The state of obtaining the above engineering information is set as the state of starting temporary road changes, The above map update server performs the following actions: The initial state is moved to "invalid". When the above-mentioned engineering information is obtained in the above-mentioned "invalid" state, it is moved to "preparation". When a road change occurs in the above-mentioned "preparation" state, it is updated to update data and moved to "holding". When a road change occurs in the above-mentioned "holding" state, after updating to update data, if the update data is consistent with the map data before the temporary road change, it is moved to "reusable". If they are inconsistent, the retained map data is discarded and moved to the above-mentioned "invalid". When a road change occurs in the above-mentioned "reusable" state, after updating to update data, the retained map data is discarded and moved to the above-mentioned "invalid". When the latest map is requested from the vehicle-mounted terminal, "map update" is indicated when "invalid" is indicated, and the updated data is attached with a map version and distributed; "no update" is indicated when "preparing" is indicated; "map retention" is indicated when "reserved" is indicated, and the updated data is attached with a map version and distributed; and "map reuse" is indicated when "reusable" is indicated, and the map version is distributed. The above-mentioned vehicle-mounted terminal performs the following actions: When requesting update data from the above-mentioned map update server and being instructed as "no update", no operation is performed; when being instructed as "map update", the map data is updated to the update data distributed by the above-mentioned map update server; when being instructed as "map retention", the map data is retained and updated to the update data; when being instructed as "map reuse", the retained map data is restored and the own map version is updated.

2. The map updating method according to claim 1, wherein: The map update server instructs to retain the map data when instructing to temporarily use the update data, and instructs to reuse the retained map data when instructing to use the update data before the temporary road change starts. The vehicle-mounted terminal retains the map data before the temporary road change when instructed to retain the map data, and restores the retained map data when instructed to reuse the map data.

3. The map updating method according to claim 2, wherein: When the in-vehicle terminal is instructed not to retain the map data but to reuse it, it continues to use the map data before the temporary road change.

4. A map update server, which is capable of updating the map data of the vehicle-mounted terminal by responding to the confirmation result when the vehicle-mounted terminal requests confirmation of whether there is update data, wherein the update data is map data for update, The vehicle-mounted terminal is configured to include a vehicle-mounted terminal-side update management unit, which temporarily uses the update data by using the distributed update data when the update data is temporarily used as the confirmation result from the map update server, and by using the map data before the temporary road change is started instead of the update data when the update data before the temporary road change is started is instructed as the confirmation result. The map update server includes a server-side update management unit. When the request confirmation is received in a state where update data after a temporary road change is started is available, the server-side update management unit responds to the confirmation result by instructing temporary use of the update data and distributing the update data. When the request confirmation is received in a state where update data after a temporary road change is ended is available, the server-side update management unit responds to the confirmation result by instructing use of update data before the temporary road change is started. The above map update server obtains project information, The state of obtaining the above engineering information is set as the state of starting temporary road changes, The above map update server performs the following actions: The initial state is moved to "invalid". When the above-mentioned engineering information is obtained in the above-mentioned "invalid" state, it is moved to "preparation". When a road change occurs in the above-mentioned "preparation" state, it is updated to update data and moved to "holding". When a road change occurs in the above-mentioned "holding" state, after updating to update data, if the update data is consistent with the map data before the temporary road change, it is moved to "reusable". If they are inconsistent, the retained map data is discarded and moved to the above-mentioned "invalid". When a road change occurs in the above-mentioned "reusable" state, after updating to update data, the retained map data is discarded and moved to the above-mentioned "invalid". When the latest map is requested from the vehicle-mounted terminal, "map update" is indicated when "invalid" is indicated, and the updated data is attached with a map version and distributed; "no update" is indicated when "preparing" is indicated; "map retention" is indicated when "reserved" is indicated, and the updated data is attached with a map version and distributed; and "map reuse" is indicated when "reusable" is indicated, and the map version is distributed. The above-mentioned vehicle-mounted terminal performs the following actions: When requesting update data from the above-mentioned map update server and being instructed as "no update", no operation is performed; when being instructed as "map update", the map data is updated to the update data distributed by the above-mentioned map update server; when being instructed as "map retention", the map data is retained and updated to the update data; when being instructed as "map reuse", the retained map data is restored and the own map version is updated.

5. A vehicle-mounted terminal, which requests a map update server to confirm whether there is update data, and can update its own map data through the response of the map update server to confirm the result, wherein the update data is map data for update, wherein: The map update server is configured to include a server-side update management unit. When the request confirmation is received in a state where update data after a temporary road change is started is available, the server-side update management unit responds to the confirmation result by instructing temporary use of the update data and distributing the update data. When the request confirmation is received in a state where update data after a temporary road change is ended is available, the server-side update management unit responds to the confirmation result by instructing use of update data before the temporary road change is started. The vehicle-mounted terminal includes a vehicle-mounted terminal-side update management unit, which temporarily uses the update data by using the distributed update data when the update data is temporarily used as the confirmation result from the map update server, and by using the map data before the temporary road change is started instead of the update data when the update data before the temporary road change is started is instructed as the confirmation result. The above map update server obtains project information, The state of obtaining the above engineering information is set as the state of starting temporary road changes, The above map update server performs the following actions: The initial state is moved to "invalid". When the above-mentioned engineering information is obtained in the above-mentioned "invalid" state, it is moved to "preparation". When a road change occurs in the above-mentioned "preparation" state, it is updated to update data and moved to "holding". When a road change occurs in the above-mentioned "holding" state, after updating to update data, if the update data is consistent with the map data before the temporary road change, it is moved to "reusable". If they are inconsistent, the retained map data is discarded and moved to the above-mentioned "invalid". When a road change occurs in the above-mentioned "reusable" state, after updating to update data, the retained map data is discarded and moved to the above-mentioned "invalid". When the latest map is requested from the vehicle-mounted terminal, "map update" is indicated when "invalid" is indicated, and the updated data is attached with a map version and distributed; "no update" is indicated when "preparing" is indicated; "map retention" is indicated when "reserved" is indicated, and the updated data is attached with a map version and distributed; and "map reuse" is indicated when "reusable" is indicated, and the map version is distributed. The above-mentioned vehicle-mounted terminal performs the following actions: When requesting update data from the above-mentioned map update server and being instructed as "no update", no operation is performed; when being instructed as "map update", the map data is updated to the update data distributed by the above-mentioned map update server; when being instructed as "map retention", the map data is retained and updated to the update data; when being instructed as "map reuse", the retained map data is restored and the own map version is updated.

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