Map update procedure, map update server and on-board terminal

Abstract

The map update server includes a server-side update management unit (19a) which, in response to receiving an acknowledgment request from the on-board terminal in a state where updated data is available after the start of a temporary road change, distributes the updated data and sends an acknowledgment result to instruct the on-board terminal to use the updated data temporarily, and in response to receiving an acknowledgment request from the on-board terminal in a state where the updated data is available after the end of a temporary road change, sends the acknowledgment result to instruct the on-board terminal to use the updated data from before the start of the temporary road change.The on-board terminal includes an on-board terminal-side update management unit (10a) which, in response to the acknowledgment result from the map update server, instructs the on-board terminal to temporarily use the updated data, uses the updated data that has already been distributed, and in response to the acknowledgment result from the map update server, instructs the on-board terminal to use the updated data from before the start of a temporary road change, temporarily uses the updated data using map data from before the start of the temporary road change instead of the updated data.

Description

[Cross-reference to related registration]

[0001] The present application is based on and claims priority of the Japanese patent application number 2018-172499 filed on September 14, 2018, the full disclosure of which is hereby incorporated by reference. [Technical field]

[0002] The present disclosure relates to a map update system, a map update server and an onboard terminal. [State of the art]

[0003] Traditionally, there is a method in which comparative / statistical processing is performed on road data and a trajectory of a vehicle passing on a road, and a map update server detects a change in the road and updates map data in an on-board terminal (see patent document 1). [Bibliography][Patent Literature]

[0004] [Patent Document 1] Japanese Patent Publication No. 6302848 [Overview of the invention]

[0005] In a technology described in patent document 1, a map update server performs an update / distribution of map data each time a change in a road condition (hereinafter referred to as a road change) is detected. Therefore, it can be expected that the map data will be updated immediately.

[0006] However, for example, in a situation where a temporary road change occurs, such as when a road is reset to its original state after roadwork (like road restoration), the road change happens twice (once at the start and once at the end of the work). Consequently, the map data update / distribution is performed twice before the temporary road change ends. Therefore, if the onboard terminal temporarily uses the map data updated for the temporary road change, the map data, which is the same as that of the original road, is unnecessarily distributed after the work ends. This increases the volume or amount of data communication.

[0007] The present disclosure provides a map data update system, a map update server and an on-board terminal that can reduce the amount of data communication between the on-board terminal and the map update server in a state where a temporary road change occurs.

[0008] According to one aspect of the present disclosure, in response to an acknowledgment request being received from an onboard terminal in a state where updated data is available following the initiation of a temporary road change, a server-side update management unit of a map update server sends an acknowledgment result to distribute the data and instruct the onboard terminal to temporarily use the updated data.

[0009] In response to the confirmation result from the map update server ( 2) to instruct the onboard terminal to temporarily use the updated data, uses an onboard terminal-side update management unit ( 10a ) of the on-board terminal the distributed updated data.

[0010] In response to the confirmation request being received from the onboard terminal in a state where updated data is available after the end of a temporary road change, the server-side update management unit of the map update server sends a confirmation result to instruct the onboard terminal to use the updated data from before the start of the temporary road change.

[0011] In response to the confirmation result from the map update server to instruct the on-board terminal to use the updated data from before the start of the temporary road change, the on-board terminal's update management unit temporarily uses the updated data using map data from before the start of the temporary road change instead of the updated data.

[0012] As a result of operations like the above, when the onboard terminal temporarily uses the updated data, data communication between the onboard terminal and the card update server can be suppressed. Therefore, the amount of data communication can be reduced. List of characters

[0013] The above-described task, further tasks, properties, and advantages of the present disclosure will become clearer from the following detailed description in conjunction with the drawings. These show: Fig. 1 a functional block diagram of a map update system according to one embodiment; Fig. 2 a flowchart that schematically shows communication operations between a vehicle navigation device and a server; Fig. 3. A flowchart of an extended preparation operation by the server; Fig. 4. A flowchart of a map update operation or map management operation by the server; Fig. 5 a flowchart of an extended preparatory operation by the vehicle navigation device; Fig. 6. A flowchart of a map update processing operation by the vehicle navigation device; Fig. 7. A flowchart of a vehicle navigation device response processing operation by the server; and Fig. Figure 8 shows a diagram illustrating the interconnected operations of the vehicle navigation device and the server. [Description of embodiments]

[0014] One embodiment is described below with reference to the drawings. As shown in Fig. As shown in Figure 1, a map data update system is configured by a vehicle navigation system (hereinafter referred to as the vehicle navigation device; equivalent to an on-board terminal) 1, which is mounted in a vehicle, and a map update server (hereinafter referred to as a server; equivalent to a server) 2, which is located in an information center. The vehicle navigation device 1is configured to be a position sensing device 3 , a storage device 4 , a display device 5 , an audio output device 6 , a group of control switches 7 , a radio communication device 8 , an interface (I / F) 9 for external equipment and a control device 10 to include.

[0015] The position detection device 3 is through a geomagnetic sensor 11 , a gyroscope 12 , a vehicle speed sensor 13 and a GPS receiver 14 (Receiver for global positioning system) configured. The positioning device 3 It successively determines the current position of the vehicle based on detection signals from the multiple components. 11 until 14 The position detection device 3does not need to go through all of the multiple components 11 until 14 It can be configured and can be configured by a section of the components. For example, the storage device 4 A read / write storage device such as a hard disk drive. The storage device 4 has a map data storage unit 4a and a storage unit 4b for secure map data. For example, the storage device 4 It must be configured to be removed, for example in a similar way to an SD (Secure Digital) memory card.

[0016] For example, the display device 5 It must be capable of full-color display and configured using a liquid crystal display, an organic electroluminescent (EL) display, a plasma display, or the like. The audio output device 6is configured by a loudspeaker or similar device and provides voice guidance and the like based on a command from the control device 10 off. For example, the control switch group 7 through a touch field that is connected to the display device 5 is integrated, or configured with mechanical switches. The operating switch group 7 indicates to the control device 10 a switching signal based on a switching operation performed by the user.

[0017] The radio communication device 8 provides a function for executing communication with the server 2 via a public network 15 such as a mobile network or the internet. For example, the radio communication device 8It can be configured by an on-board communication module used in telematics communication, such as a data communication module (DCM) mounted in a vehicle, or by a dedicated short-range communication module (DSRC module). Furthermore, the radio communication device can 8 It may be configured via a Bluetooth communication module (Bluetooth is a registered trademark) and can be configured to communicate with the server. 2 to be carried out by a mobile terminal (such as a mobile phone or a smartphone) connected via Bluetooth communication.

[0018] For example, the interface can 9 It may be configured for external equipment via an interface for connecting to an external computer or similar device using a Universal Serial Bus (USB) or similar. A configuration may be such that communication with the server 2via radio communication through the interface 9 is performed for external equipment and the external computer.

[0019] The control device 10 It is primarily configured by a microcomputer consisting of a central processing unit (CPU), read-only memory (ROM), random access memory (RAM), backup RAM, and the like. The control device 10 provides functions of an update management unit 10a (corresponds to an onboard terminal-side update management unit) and an acquisition unit 10 ready. The control device 10 It performs map display processing, route retrieval processing, route guidance processing, and the like as a navigation function based on different types of information provided by the position detection device. 3 , the storage device 4, the control switch group 7 , the radio communication device 8 and the interface 9 can be entered for external equipment.

[0020] If map data is stored in the map data storage unit 4a the storage device 4 The data stored is updated to reflect the latest map data, and the control device sends and receives it. 10 Information on updating map data through communication with the server 2 through the radio communication device 8 , the interface 9 for external equipment or the like. That is, the control device. 10 The updated data is downloaded by submitting an update request to the server. 2 downloads and updates the applicable map data stored in the map data storage unit. 4a the storage device 4 are stored.

[0021] The server 2 is through a display device 16 , a communication device 17 , a storage device 18 and a control device 19 configured and connected to the public network 15 through the communication device 17 connected. The storage device 18 is configured to be a map data storage unit 18a and a storage unit 18b to have secure map data.

[0022] The control device 19 It is primarily configured by a microcomputer consisting of a CPU, ROM, RAM, backup RAM, and the like. The control device 19 It functions as an update management unit. 19a (corresponds to a server-side update management unit) ready. The control device 19It collects sample information consisting of image data and position data captured by multiple sample vehicles through the public network 15 If the map data is determined to have changed, based on the collected sample information, the control device generates 19 the updated data, which is the latest data.

[0023] If a confirmation request regarding the updated data from the vehicle navigation device 1 When a submission is made, the server responds 2 with the applicable updated data, which constitutes a confirmation result. The response here refers to the distribution of the updated data or a command for data processing in an on-board component. Accordingly, for example, even if a road change occurs, the vehicle navigation device 1the updated data corresponding to a road change, from the server 2 can obtain and perform route retrieval processing, the vehicle navigation device 1 different types of navigation functions are provided to the user according to the road change.

[0024] The road change concerns a case where the server 2A road change affecting the vehicle's route is determined based on sample information collected from multiple sample vehicles. A detour is primarily considered a case where the road change occurs. However, the road change encompasses any alteration affecting the vehicle's route, such as changes in traffic regulations (like road closures) and lane configurations. The latest map data is not limited to sample information and can be obtained from a map data provider.

[0025] For example, in a case where the vehicle passes through a section where a temporary road change occurs, navigation (such as driving / guiding / route retrieval) can be performed based on the updated data to avoid the effects of the road change.

[0026] However, in a case where, after a temporary road change, a road environment is reset to the road environment before the road change, or where this road is restored, because the updated data, which is the same data as the original map data, is retrieved from the server 2 received and used, a data communication amount between the vehicle navigation device 1 and the server 2 unnecessary.

[0027] Based on such circumstances, according to the present embodiment, the data communication amount between the vehicle navigation device 1 and the server 2 reduced in the following way during temporary road changes.

[0028] First, basic operations are performed between the vehicle navigation device. 1 and the server 2 described.

[0029] As in Fig. 2 is shown when a road change occurs (YES at S11 ), the server determines 2 a status ( S12 ).

[0030] The vehicle navigation device 1 sends a confirmation request to the server regarding the updated data. 2 from when the vehicle is moving. If the confirmation request is from the vehicle's navigation system. 1 is received (YES at S31 ), the server replies 2 the vehicle navigation device 1 with the confirmation result based on the current status ( S32 ). Is the confirmation result from the server 2 received (YES at S22 ), the vehicle navigation device 1 a map data update process based on the confirmation result from ( S23 ).

[0031] In a manner such as the above, the navigation function corresponding to the road change can be provided to the user.

[0032] The following describes the operations that take place in Fig. Figure 2 shows a case in which the vehicle is temporarily driving on a diversion route, which represents road restoration work, described as an example.

[0033] As in Fig. As shown in section 3, this is considered an extended preparation of the server. 2 Change management information = "invalid" fixed ( S101 Meanwhile, as in Fig. As shown in section 5, the vehicle navigation device 1 Information secured as extended preparation = OFF fixed ( S301 ). Operations for the vehicle navigation device 1, when a typical change in road condition needs to be reflected. If the change management information = "invalid".

[0034] As in Fig. As shown in section 4, the server collects 2 Information (hereinafter referred to as road change information) about the location and duration of road work and the like ( S201 ) and determines whether a road change has occurred, based on the sample information ( S202 If it is determined that a road change has occurred (YES in the case of S202 ), the server determines 2 the change management information ( S203 ). Since at this time change management information is considered "invalid" (YES at S203 ), the server updates 2 the map data stored in the map data storage unit 18a the storage unit 18 are stored, updated to the latest map data ( S204 ).

[0035] The updated data is generated in a manner like the above every time a road change occurs.

[0036] In this case, when the user sets a destination, the vehicle navigation system 1 a guided route to a in Fig. 6 as shown, determines and provides the guided route to the user ( S401 The user drives the vehicle based on the guided route provided by the vehicle's navigation device. 1 is provided. The vehicle navigation device 1 sends a confirmation request regarding the updated data when the vehicle moves ( S402 At this time, a map version of the vehicle navigation device will also be available. 1 sent.

[0037] As in Fig. Figure 7 shows when the confirmation request regarding the updated data is sent from the vehicle navigation device. 1 is received (YES at S501 ), the server determines 2 the change management information ( S502). Since at this time change management information is considered "invalid" (YES at S502 ), the server confirms 2 the vehicle's own map version and the received map version of the vehicle navigation device 1 ( S503 If both map versions are the same (YES if S504 ), since the map data does not need to be updated, the server places 2 Response type = "no update" ( S509 ) and then responds with the response type ( S507 ).

[0038] If response type = "no update" is received (YES at S404 ), has the vehicle navigation device 1 No operation to be performed.

[0039] However, if both versions of map data differ (NO if S504 ), the server places 2 the latest map data ( S505 ) and sets response type = "Map updated" ( S506 ). The server 2then sends the response type and map data ( S507 ).

[0040] Will the response type = "Map updated" be received (YES if S405 ), updates the vehicle navigation system 1 the map data on the received map data ( S406 ) and determines whether verified information = ON ( S407 Since at this time confirmed information = OFF (NO in case of S407 ), has the vehicle navigation device 1 No operation to execute. This applies when confirmed information = ON (YES in case of...). S407 ), places the vehicle navigation device 1 Secured information = OFF fixed ( S408 The secured information is information indicating that the map data is secured. Operations for the vehicle navigation device 1, when a change in road conditions during a working period needs to be reflected

[0041] This is determined in the extended preparation, which in Fig. As shown in Figure 3, if change management information is deemed "invalid", as described above, the server 2 , whether work information is obtained from an official announcement, a website on the internet or the like ( S102 ). If the work information is obtained (YES if S102 ), the server places 2 Change management information = “prepared” fixed ( S103 ).

[0042] The extended preparation is completed in the manner described above. If change management information = "prepared" applies

[0043] If the confirmation request regarding the updated data from the vehicle navigation device 1 is received (YES at S501 ), since change management information is considered "prepared" (YES in case S508 ), the server places 2Response type = "no update" fixed ( S509 ) and then sends the response type ( S507 ).

[0044] Since response type = "no update" is received (YES at S404 ), has the vehicle navigation device 1 No operation to be performed.

[0045] In the manner described above, when change management information is set to "prepared", the map data is stored in the vehicle navigation device. 1 not updated.

[0046] If, as a result of a test vehicle driving a detour, it is determined that a road change has occurred (YES if S202 ), the server takes 2 , since change management information is considered "prepared" (YES in case S205 ), indicating that work has begun and securing the map data in the storage unit 18b for secured map data of the storage device 18 ( S206The saved map data is the map data from before work began, and the map version is Ver. 0. This map version is provisionally referred to as Ver. 0 to simplify the description and is in fact the actual map version at that time.

[0047] Next, after updating the map data ( S208 ) the server 2 Change management information = “saved” fixed ( S208 ).

[0048] In the manner described above, while the map data from before the start of work is in the server 2 Once the data is backed up, it will be updated to reflect the changes made after work begins. If change management information = "saved" applies

[0049] If a work section is located on a retrieved route or the vehicle is approaching a work section while driving, the vehicle navigation device sends a notification. 1A confirmation request regarding the updated data, including the work section. If the confirmation request regarding the updated data is from the vehicle navigation device. 1 is received (YES at S501 ), since change management information is considered "saved" (YES in case S510 ) applies, the server sets 2 the map data fixed ( S511 The map data is the map data after work has started, and the map version is Ver. 1. Next, the server creates 2 Response type = "Save card" fixed ( S512 ) and then sends the response type and map data ( S507 ).

[0050] If the response from the server 2 is received (YES at S403 ), since response type = "Secure card" applies (YES at S409 ), secures the vehicle navigation device 1 the map data ( S410The map data at this time is the map data from before work began, and the map version is Ver. 0. Next, the vehicle navigation device... 1 Secured information = ONE fixed ( S411 and updates the map data to the updated data ( S412 The updated data are the map data after work began, and the map version is Ver. 1.

[0051] Is it determined that a road change has occurred as a result of a test vehicle driving on a road instead of a detour route prior to roadworks (YES if S202 ), since change management information is "backed up" (YES in case S209 ), the server takes 2 indicates that the work is finished and updates the map data ( S210 The map data at this time is the map data after the end of the workday, and the map version is Ver. 2.

[0052] Next, the server compares 2 the card data with the secured card ( S211 ) and determines whether the card data and the secured card match ( S212 A road segment unit, an area unit, or the like can be assumed as the area over which the agreement of map data is determined. If the road changes after the work is completed, there is a case in which the road in the work segment is restored to the road as it was before the work began, and a case in which the road is not restored. If the road is restored to the road as it was before the work began, because the updated data matches the saved map data (YES in this case). S212 ), the server places 2 Change management information = “reusable” fixed ( S213 ).

[0053] However, if the street differs from the one before work started because the updated data does not match the saved map (NO in this case) S212 ), the server discards 2 the secured map data ( S215 ) and then sets change management information to "invalid" ( S216 ). If change management information = “reusable” applies

[0054] If the confirmation request regarding the updated data from the vehicle navigation device 1 is received (YES at S501 ), since change management information is considered "reusable" (NO in case of S510 ) applies, the server sets 2 the map version fixed ( S513 ) and sets response type = "Reuse card" ( S514 ). The server 2 then sends the response type and map version ( S507 The map version at that time is version 2.

[0055] In the manner described above, if change management information is set to "reusable," only the map version is sent, and the map data is not. One reason for this is that the vehicle navigation device 1 The secured map data will continue to be used in the following way.

[0056] If the response from the server 2 (YES at S403 ) is received because response type = "Reuse card" applies (NO if S409 ), confirms the vehicle navigation system 1 , whether verified information = ON ( S413 Since verified information = ONE applies (YES in the case of...). S413 ), provides the vehicle navigation device 1 restore the backed-up map data ( S414 The version of the backed-up map data at that time is Ver. 0.

[0057] Next, after updating the received map version ( S415) the vehicle navigation device 1 the secured information = OFF fixed ( S416 The map version at this time is the map version after work has ended and is version 2.

[0058] In the above manner, the vehicle navigation device can be 1 Perform navigation based on the restored, backed-up map data.

[0059] If a road change has occurred (YES if S202 ), if change management information = “reusable” (NO if S209 ), the server updates 2 the map data ( S214 The map version at this time is Ver. 3. Next, the server discards... 2 the secured map data ( S215 ) and then sets change management information to "invalid" ( S216 ).

[0060] Subsequently, since the map data is updated every time a road change occurs, the vehicle navigation device calls 1 the guided route based on the updated data from the server 2 be received.

[0061] When the operations of the vehicle navigation device 1 and the server 2 The operations described above can be summarized as follows: Fig. Figure 8 is shown to express this. Fig. 8 a case in which the updated data after the end of the work period matches the saved map data, that is, when saved information = ON.

[0062] 3. Operations for the vehicle navigation device 1 , when a change in road conditions needs to be reflected after a period of work (the map data in the vehicle navigation device) 1(will not be updated during working hours)

[0063] If the vehicle does not reach the work section during the work period, but reaches the work section for the first time after the work has ended, the vehicle navigation device receives 1 Response type = "Reuse card" from the server 2 , without backing up the card data (NO at S409 Therefore, the map data described above is not available.

[0064] This applies if the answer type is "Reuse card" (NO if S409 ), if secured information = OFF applies (NO if S413 ), updates the vehicle navigation system 1 the map version of your own map data, without restoring the backed-up map data ( S415The map version at that time is Ver. 2. In this case, since the map data remains the same as before work began and is identical to the update data after work ended, the vehicle navigation device can 1 Retrieve the route by continuously using the map data from before work began.

[0065] According to an embodiment such as this, the following effects can be achieved.

[0066] The server 2 Determines the change management information (status) when a road change occurs and responds with a confirmation result based on the change management information when a confirmation request regarding the updated data is received from the vehicle navigation device. 1 is received. The vehicle navigation system 1Performs map data update processing based on the confirmation result from the server. 2 Therefore, if the map data is determined to be the same as before the roadwork, as a result of the temporary roadwork being completed, the backed-up map data from before the roadwork can be restored and used. Consequently, data communication between the vehicle navigation device is possible. 1 and the server 2 After the workday ends, data communication between the vehicle navigation system and the vehicle navigation device can be suppressed. 1 and the server 2 be reduced.

[0067] If response type = "Reuse map" and saved information = OFF, meaning if the vehicle does not pass through the work section during the work period but passes through it for the first time after the work has ended, the vehicle navigation device can 1 Use your own map data from before work started as the latest map data instead of restoring the backed-up map data. Consequently, the amount of data communication between the vehicle navigation device and the system can be adjusted in a similar way to when the backed-up map data is used as described above. 1 and the server 2 be reduced.

[0068] The server 1 can appropriately determine the work stage and duration and perform efficient processing by obtaining detailed information about the work stage and duration as work information from outside.

[0069] When updating map data, the map data update management process is carried out by assigning a map version in units of updates based on an update date or similar. However, if a reuse instruction regarding the saved data is on the side of the vehicle navigation device... 1 or instructions on how to use existing map data as it is provided by the server 2 Only administrative information will be updated to the latest information and the map data will be displayed on the vehicle navigation device page. 1 They remain old. Therefore, consistency with other administrative information can be maintained. (Other embodiments)

[0070] The map data update process can be performed using communication via Wi-Fi or a medium such as USB, in addition to communication via DCM.

[0071] Attributes, when determining a match of map data, can be not only a form such as road topography, but can also be road attributes such as a number of traffic lanes and regulations, as well as ground objects such as a sign at the roadside.

[0072] In addition to official notices, prefectural notices and printed and online information provided by road administrators / construction managers, image recognition of construction site signs and the like, camera images from the vehicle and infrastructure information such as the Vehicle Information and Communication System (VICS registered trademark) and Dedicated Short Range Communication (DSRC) can also be used as a means of obtaining temporary roadwork information.

[0073] The onboard terminal is not limited to the vehicle's navigation system. A smartphone, tablet, or personal computer can be used.

[0074] Updating map data for automated driving is also applicable.

[0075] The present disclosure is described based on the embodiments. However, it is evident that the present disclosure is not limited to the embodiments and constructions. The present disclosure is intended to cover various examples and modifications in the area of ​​equivalence. Furthermore, in addition to the various combinations and configurations, other combinations and configurations, including more, fewer, or only a single element, also fall within the spirit and scope of the present disclosure. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2018172499

[0001]

Claims

[1] Map update system, comprising: an onboard terminal (1) that sends a confirmation request regarding whether updated data, which are map data for updating, are available; and a map update server (2) which, in response to the receipt of the acknowledgment request from the onboard terminal, sends an acknowledgment result to enable the onboard terminal to update map data in the onboard terminal, wherein: the map update server includes a server-side update management unit (19a) which In response to the confirmation request being received by the on-board terminal in a state where the updated data is available after the start of a temporary road change, the updated data is distributed and the confirmation result is sent to instruct the on-board terminal to temporarily use the updated data, and In response to the confirmation request being received by the onboard terminal in a state where updated data is available after the end of a temporary road change, the confirmation result is sent to instruct the onboard terminal to use the updated data from before the start of the temporary road change; and the onboard terminal includes an onboard terminal-side update management unit (10a) which In response to the confirmation result from the map update server to instruct the onboard terminal to temporarily use the updated data, the updated data that had already been distributed was used, and In response to the confirmation result from the map update server to instruct the on-board terminal to use the updated data from before the start of the temporary road change, the updated data is temporarily used using the map data from before the start of the temporary road change instead of the updated data. [2] Map update system according to claim 1, wherein: the server-side update management unit instructs the onboard terminal to save the card data when the onboard terminal is instructed to temporarily use the updated data, and instructs the on-board terminal to reuse the saved map data when the on-board terminal is instructed to use the updated data from before the start of the temporary road change; and the onboard terminal-side update management unit The map data from before the temporary road change is saved in response to the map update server instructing the onboard terminal to save the map data, and restores the backed-up map data in response to the map update server instructing the onboard terminal to reuse the map data. [3] Map update system according to claim 2, wherein: The onboard terminal's update management unit continues to use the map data from before the temporary road change in response to the map update server instructing the onboard terminal to reuse the map data, without instructing the onboard terminal to save the map data. [4] Map update system according to any one of claims 1 to 3, wherein the map update server includes an acquisition unit (10b) that obtains work information; and The server-side update management unit defines a state in which the acquisition unit obtains the work information as a state in which the temporary road change begins. [5] Map update system according to claim 4, wherein: the server-side update management unit sets the status of administrative information to an invalid state in response to the fact that the administrative information is in an initial state, sets the status of administrative information to a prepared state in response to the acquisition of work information when the administrative information indicates an invalid state. In response to the fact that a road change occurs when the status of administrative information indicates the prepared state, the map data is updated to the updated data, and the status of administrative information is set to a secured state, In response to the fact that a road change occurs when the status of administrative information indicates the secured state, the map data is updated to reflect the updated data. if the updated data matches the map data from before the temporary road change, sets the status of administrative information to a reusable state, and If the updated data does not match the map data from before the temporary road change, the backed-up map data is discarded and the status of administrative information is set to invalid, and In response to the fact that a road change occurs when the status of administrative information indicates the reusable state, the map data is updated to the updated data, the saved map data is discarded, and the status of administrative information is set to the invalid state, and when a new card is requested through the onboard terminal, The updated data, to which a map version has been added, is distributed, and the onboard terminal is instructed to update the map data if the status of administrative information indicates an invalid state. instructs the onboard terminal not to update the map data when the status of administrative information indicates the prepared state, the updated data, to which a map version has been added, is distributed, and the onboard terminal is instructed to save the map data when the management information status indicates a saved state, and instructs the onboard terminal to reuse the card data and distributes the card version when the status of administrative information indicates a reusable state; and when the updated data is requested from the map update server, the onboard terminal-side update management unit performs no operation in response to being instructed not to update the map data, The map data is updated to reflect the updated data distributed by the map update server in response to being instructed to update the map data. backs up the map data and updates the map data to the updated data, in response to being instructed to back up the map data, and restores the backed-up map data and updates its own map version in response to being instructed to reuse the map data. [6] Map update server which sends a confirmation result in response to a confirmation request from an onboard terminal (1) regarding whether updated data, which are map data for updating, are available and enables the onboard terminal to update map data in the onboard terminal, where the on-board terminal is an on-board terminal-side Update management unit (10a) includes, in response to the confirmation result from the map update server to instruct the on-board terminal to temporarily use the updated data, the updated data that has already been distributed, and in response to the confirmation result from the map update server to instruct the on-board terminal to use the updated data from before the start of a temporary road change, temporarily using the updated data using map data from before the start of the temporary road change instead of the updated data. where the map update server has: a server-side update management unit (19a) which, in response to the acknowledgment request being received from the on-board terminal in a state where the updated data is available after the start of a temporary road change, sends the acknowledgment result to distribute the updated data and instruct the on-board terminal to use the updated data temporarily, and in response to the acknowledgment request being received from the on-board terminal in a state where the updated data is available after the end of a temporary road change, sends the acknowledgment result to instruct the on-board terminal to use the updated data from before the start of the temporary road change. [7] Onboard terminal which sends a confirmation request to a map update server (2) regarding whether updated data, which are map data for updating, are available and enables map data to be updated in response to a confirmation result from the map update server, where the map update server is a server-side The update management unit (19a) includes, in response to the acknowledgment request being received from the on-board terminal in a state where the updated data is available after the start of a temporary road change, the acknowledgment result is sent to distribute the updated data and instruct the on-board terminal to use the updated data temporarily, and in response to the acknowledgment request being received from the on-board terminal in a state where the updated data is available after the end of a temporary road change, the acknowledgment result is sent to instruct the on-board terminal to use the updated data from before the start of the temporary road change. the on-board terminal features: an on-board terminal-side update management unit (10a) which, in response to the acknowledgment result from the map update server to instruct the on-board terminal to temporarily use the updated data, uses the updated data that has already been distributed, and, in response to the acknowledgment result from the map update server to instruct the on-board terminal to use the updated data from before the start of a temporary road change, temporarily uses the updated data using map data from before the start of the temporary road change instead of the updated data.