Map update system, map update server and vehicle-mounted terminal

Abstract

Map update procedure, including: Sending by an on-board terminal (1) a confirmation request as to whether updated data, which is map data for updating, is available; in response to receiving the confirmation request of the on-board terminal (1), sending by a map update server (2) a confirmation result to enable the on-board terminal (1) to update map data in the on-board terminal (1); in response to the confirmation request of the on-board terminal (1) being received in a state where the updated data is available after the start of a temporary road change, distributing the updated data by a map update server (2) and sending the confirmation result by the map update server (2) to instruct the on-board terminal (1) to temporarily use the updated data; or in response to the confirmation request of the on-board terminal (1) being received in a state where the updated data is available after the end of a temporary road change, the map update server (2) sending the confirmation result to instruct the on-board terminal (1) to use the updated data from before the start of the temporary road change; in response to the confirmation result of the map update server (2) for instructing the on-board terminal (1) to temporarily use the updated data, temporarily using by the on-board terminal (1) the updated data that has already been distributed; and in response to the confirmation result of the map update server (2) for instructing the on-board terminal (1) to use the updated data from before the start of the temporary road change. Use by the on-board terminal (1) of the updated data using the map data from before the start of the temporary road change instead of the updated data.

Description

[Technical field]

[0001] The present disclosure relates to a map update method, a map update server, and an onboard terminal. [State of the art]

[0002] Conventionally, there is a method in which comparison processing / statistical processing is performed for road data and a trajectory of a vehicle passing on a road, and a map update server detects a change of the road and updates map data in an onboard terminal (see JP 6 302 848 B2). [Overview of the invention]

[0003] In a technology disclosed in JP 6 302 848 B2, a map update server performs update / distribution of map data each time a change in road conditions (hereinafter referred to as a road change) is detected. Therefore, the map data can be expected to be updated promptly.

[0004] However, for example, in a situation where a temporary road change occurs, such as when a road is restored to its original state after a road change such as road restoration work, the road change occurs twice (after the start and end of the work). Therefore, the update / distribution of map data is performed twice before the end of the temporary road change. Therefore, when the onboard terminal temporarily uses the map data updated for the temporary road change, the map data that is the same as that of the original road is unnecessarily distributed after the end of the work. Therefore, the amount of data communication increases by this amount.

[0005] Reference is further made to JP 2018 - 206 024 A, JP 2007 - 085 838 A and JP 2006 - 052 973 A, which have been identified as prior art.

[0006] An object of the present invention is to provide a map update method, a map update server, and an onboard terminal that can reduce a data communication amount between the onboard terminal and the map update server in a state where a temporary road change occurs.

[0007] The object is achieved by the map update method according to independent claim 1, by the map update server according to independent claim 6 and by the on-board terminal according to independent claim 1. Advantageous further developments can be found in the dependent claims.

[0008] This allows data communication between the onboard terminal and the map update server to be suppressed when the onboard terminal temporarily uses the updated data. Thus, the amount of data communication can be reduced. [Brief description of the drawings]

[0009] The above-described object, further objects, features, and advantages of the present disclosure will become more apparent from the following detailed description taken in conjunction with the drawings. Fig. 1 is a functional block diagram of a map update system according to an embodiment; Fig. 2 is a flowchart schematically showing communication operations between a vehicle navigation device and a server; Fig. 3 a flowchart of an extended preparation operation by the server; Fig. 4 is a flowchart of a map update operation or map management operation by the server; Fig. 5 is a flowchart of an extended preparation operation by the vehicle navigation device; Fig. 6 is a flowchart showing a map update processing operation by the vehicle navigation device; Fig. 7 is a flowchart of a vehicle navigation device response processing operation by the server; and Fig. 8 is a diagram showing operations of the vehicle navigation device and the server in linkage. [Description of embodiments]

[0010] An embodiment will be described below according to the drawings. As in Fig. 1, a map update system is configured by a vehicle navigation system (hereinafter referred to as a vehicle navigation device; corresponds to an onboard terminal) 1 mounted in a vehicle and a map update server (hereinafter referred to as a server; corresponds to a server) 2 installed in an information center. The vehicle navigation device 1 is configured to include a position detection device 3, a storage device 4, a display device 5, an audio output device 6, an operation switch group 7, a radio communication device 8, an external equipment interface (I / F) 9, and a control device 10.

[0011] The position detection device 3 is configured by a geomagnetic sensor 11, a gyroscope 12, a vehicle speed sensor 13, and a GPS (Global Positioning System) receiver 14. The position detection device 3 successively detects a current position of the vehicle based on detection signals from the plurality of components 11 to 14. The position detection device 3 does not need to be configured by all of the plurality of components 11 to 14 and may be configured by a portion of the components. For example, the storage device 4 is a random access memory device such as a hard disk drive. The storage device 4 has a map data storage unit 4a and a secured map data storage unit 4b. For example, the storage device 4 may be configured to be detachable, for example, in a manner similar to an SD (Secure Digital) memory card.

[0012] For example, the display device 5 may be capable of full-color display and configured using a liquid crystal display, an organic electroluminescence (EL) display, a plasma display, or the like. The audio output device 6 is configured by a speaker or the like and outputs voice guidance and the like based on a command from the control device 10. For example, the operation switch group 7 may be configured by a touch panel integrated with the display device 5 or mechanical switches. The operation switch group 7 outputs a switching signal to the control device 10 based on a switching operation by the user.

[0013] The radio communication device 8 provides a function for performing communication with the server 2 via a public network 15 such as a cellular network or the Internet. For example, the radio communication device 8 may 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). Further, the radio communication device 8 may be configured by a Bluetooth communication module (Bluetooth is a registered trademark) and may be configured to perform communication with the server 2 through a mobile terminal (such as a mobile phone or a smartphone) connected by Bluetooth communication.

[0014] For example, the external equipment interface 9 may be configured as an interface for connecting to an external computer or the like using a Universal Serial Bus (USB) or the like. A configuration may be such that communication with the server 2 is performed by radio communication through the external equipment interface 9 and the external computer.

[0015] The control device 10 is mainly configured by a microcomputer consisting of a central processing unit (CPU), a read-only memory (ROM), a random access memory (RAM), a backup RAM, and the like. The control device 10 provides functions of an update management unit 10a (corresponding to an on-board terminal-side update management unit) and an acquisition unit 10. The control device 10 executes map display processing, route retrieval processing, and route guidance processing, and the like, as a navigation function, based on various types of information input from the position detection device 3, the storage device 4, the operation switch group 7, the radio communication device 8, and the external equipment interface 9.

[0016] When map data stored in the map data storage unit 4a of the storage device 4 is updated to updated data that is the latest map data, the control device 10 sends and receives information for updating the map data by communicating with the server 2 through the wireless communication device 8, the external equipment interface 9, or the like. That is, the control device 10 downloads the updated data by issuing an update request to the server 2 and updates the applicable map data stored in the map data storage unit 4a of the storage device 4.

[0017] The server 2 is configured by a display device 16, a communication device 17, a storage device 18, and a control device 19, and is connected to the public network 15 through the communication device 17. The storage device 18 is configured to have a map data storage unit 18a and a secured map data storage unit 18b.

[0018] The control device 19 is mainly configured by a microcomputer composed of a CPU, a ROM, a RAM, a backup RAM, and the like. The control device 19 provides a function as an update management unit 19a (corresponding to a server-side update management unit). The control device 19 collects sample information consisting of image data and position data acquired by a plurality of sample vehicles through the public network 15. When the map data is determined to have changed based on the collected sample information, the control device 19 generates the updated data, which is the latest data.

[0019] When a confirmation request regarding the updated data is issued from the vehicle navigation device 1, the server 2 responds with the applicable updated data, which constitutes a confirmation result. Response herein refers to distribution of the updated data or a command for data processing in an onboard component. Therefore, for example, even when a road change occurs, since the vehicle navigation device 1 can obtain the updated data corresponding to a road change from the server 2 and perform route retrieval processing, the vehicle navigation device 1 can provide various types of navigation functions to the user according to the road change.

[0020] A road change refers to a case where the server 2 determines that a road change affecting the vehicle's travel has occurred based on the sample information collected from the multiple sample vehicles. A detour route is mainly assumed as a case where a road change occurs. However, a road change refers to any changes that affect a vehicle's travel route, such as changes in traffic regulations such as road closures and changes in lanes. The latest map data is not limited to the sample information and can be obtained from a map data provider.

[0021] Here, for example, in a case where the vehicle passes a section where a temporary road change occurs, navigation (such as driving / guidance / route retrieval) that avoids the effects of the road change can be executed based on the updated data.

[0022] However, in a case where a road environment is returned to the road environment before the road change after a temporary road change or that road is restored, since the updated data, which is the same data as the original map data, is received and used by the server 2, an amount of data communication between the car navigation device 1 and the server 2 becomes unnecessary.

[0023] Based on such circumstances, according to the present embodiment, the data communication amount between the car navigation device 1 and the server 2 during temporary road change is reduced in the following manner.

[0024] First, basic operations between the vehicle navigation device 1 and the server 2 are described.

[0025] As in Fig. 2, when a road change occurs (YES at S11), the server 2 determines a status (S12).

[0026] The vehicle navigation device 1 submits a confirmation request regarding the updated data to the server 2 as the vehicle travels. When the confirmation request from the vehicle navigation device 1 is received (YES at S31), the server 2 responds to the vehicle navigation device 1 with the confirmation result based on the current status (S32). When the confirmation result from the server 2 is received (YES at S22), the vehicle navigation device 1 executes map data update processing based on the confirmation result (S23).

[0027] In a manner like the above, the user can be provided with the navigation function corresponding to the road change.

[0028] The following is to describe the operations performed in Fig. 2, a case where the vehicle temporarily travels on a detour route, which is a road restoration work, will be described as an example.

[0029] As in Fig. 3, as an extended preparation, the server 2 sets change management information = "invalid" (S101). However, as shown in Fig. 5, the car navigation device 1 sets secured information = OFF as an extended preparation (S301). 1. Operations for the vehicle navigation device 1 when a typical change in road condition needs to be reflected(1) When the change management information = "invalid" applies

[0030] As in Fig. As shown in FIG. 4, the server 2 collects information (hereinafter referred to as road change information) about a 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 at S202), the server 2 determines the change management information (S203). Since change management information = "invalid" at this time (YES at S203), the server 2 updates the map data stored in the map data storage unit 18a of the storage unit 18 to the latest map data (S204).

[0031] In a manner like the above, the updated data is generated each time a road change occurs.

[0032] Here, when the user sets a destination, the vehicle navigation device 1 sets a guide route on a Fig. 6 and provides the guidance route to the user (S401). The user drives the vehicle based on the guidance route provided by the vehicle navigation device 1. The vehicle navigation device 1 sends a confirmation request regarding the updated data as the vehicle moves (S402). At this time, a map version of the vehicle navigation device 1 is additionally sent.

[0033] As in Fig. As shown in FIG. 7, when the confirmation request of the car navigation device 1 regarding the updated data is received (YES at S501), the server 2 determines the change management information (S502). Since change management information = "invalid" at this time (YES at S502), the server 2 confirms its own map version and the received map version of the car navigation device 1 (S503). If both map versions are the same (YES at S504), since the map data does not need to be updated, the server 2 sets response type = "no update" (S509) and then responds with the response type (S507).

[0034] When response type = "no update" is received (YES at S404), the vehicle navigation device 1 has no operation to perform.

[0035] Meanwhile, if both versions of map data differ (NO at S504), Server 2 specifies the latest map data (S505) and sets response type = "Map Updated" (S506). Server 2 then sends the response type and map data (S507).

[0036] If the response type = "Map Updated" is received (YES at S405), the car navigation device 1 updates the map data to the received map data (S406) and determines whether secured information = ON (S407). Since secured information = OFF at this time (NO at S407), the car navigation device 1 has no operation to perform. Here, if secured information = ON (YES at S407), the car navigation device 1 sets secured information = OFF (S408). The secured information is information indicating that the map data is secured. 2. Operations for the vehicle navigation device 1 when a change in road conditions needs to be reflected during a working period

[0037] In this case, the extended preparation, which is Fig. As shown in Figure 3, when change management information = "invalid" as described above, the server 2 determines whether work information is acquired from an official announcement, a homepage on the Internet, or the like (S102). If the work information is acquired (YES at S102), the server 2 sets change management information = "prepared" (S103).

[0038] The extended preparation is completed in the manner described above. (2) If change management information = "prepared"

[0039] When the confirmation request of the car navigation device 1 regarding the updated data is received (YES at S501), since change management information = "prepared" holds (YES at S508), the server 2 sets response type = "no update" (S509) and then sends the response type (S507).

[0040] Since response type = "no update" is received (YES at S404), the vehicle navigation device 1 has no operation to perform.

[0041] In the manner described above, when change management information = “prepared”, the map data in the car navigation device 1 is not updated.

[0042] If it is determined that a road change has occurred as a result of a sample vehicle traveling a detour route (YES at S202), the server 2, since change management information = "prepared" (YES at S205), assumes that work has started and backs up the map data in the backed-up map data storage unit 18b of the storage device 18 (S206). The backed-up map data is the map data before work started, and the map version is Ver. 0. This map version is provisionally referred to as Ver. 0 for convenience of description, and is actually the actual map version at that time.

[0043] Next, after updating the map data (S208), the server 2 sets change management information = “saved” (S208).

[0044] In the manner described above, while the map data before the start of work is saved in the server 2, the map data is updated to the map data after the start of work. (3) If change management information = “secured”

[0045] When a work section exists on a retrieved route or the work section is approached while the vehicle is traveling, the car navigation device 1 sends a confirmation request regarding the updated data including the work section. When the confirmation request from the car navigation device 1 regarding the updated data is received (YES at S501), since change management information = "secured" holds (YES at S510), the server 2 sets the map data (S511). The map data is the map data after the work start, and the map version is Ver. 1. Next, the server 2 sets response type = "secure map" (S512) and then sends the response type and map data (S507).

[0046] When the response is received from the server 2 (YES at S403), since response type = "Backup Map" (YES at S409), the car navigation device 1 backs up the map data (S410). The map data at this time is the map data before the start of work, and the map version is Ver. 0. Next, the car navigation device 1 sets backed up information = ON (S411) and updates the map data to the updated data (S412). The updated data is the map data after the start of work, and the map version is Ver. 1.

[0047] If it is determined that a road change has occurred as a result of a sample vehicle traveling on a road instead of a detour route before road work (YES at S202), because change management information = "secured" (YES at S209), Server 2 assumes that the work is over and updates the map data (S210). The map data at this time is the map data after the work was over, and the map version is Ver. 2.

[0048] Next, the server 2 compares the map data with the backed-up map (S211) and determines whether the map data and the backed-up map match (S212). A range over which the map data match is determined can be a road section unit, an area unit, or the like. When the road changes after the work is completed, there are two cases where the road in the work section is restored to the road before the work started, and two cases where the road is not restored. If the road is restored to the road before the work started because the updated data matches the backed-up map data (YES at S212), the server 2 sets change management information = "reusable" (S213).

[0049] Meanwhile, if the road is different from that before the start of work because the updated data does not match the saved map (NO at S212), the server 2 discards the saved map data (S215) and then sets change management information = "invalid" (S216). (4) If change management information = “reusable”

[0050] When the confirmation request from the vehicle navigation device 1 regarding the updated data is received (YES at S501) because change management information = "reusable" (NO at S510), the server 2 sets the map version (S513) and response type = "reuse map" (S514). The server 2 then sends the response type and map version (S507). The map version at this time is Ver. 2.

[0051] In the manner described above, when change management information = "reusable," only the map version is transmitted, and the map data is not transmitted. One reason for this is that the car navigation device 1 continues to use the backed-up map data in the following manner.

[0052] When the response is received from the server 2 (YES at S403), since response type = "Reuse Map" (NO at S409), the car navigation device 1 confirms whether backed up information = ON (S413). Since backed up information = ON (YES at S413), the car navigation device 1 restores the backed up map data (S414). The version of the backed up map data at this time is Ver. 0.

[0053] Next, after updating the received map version (S415), the vehicle navigation device 1 sets the backed-up information = OFF (S416). The map version at this time is the map version after the work is terminated and is Ver. 2.

[0054] In the above manner, the vehicle navigation device 1 can perform navigation based on the restored backed-up map data.

[0055] If a road change has occurred (YES at S202), when change management information = "reusable" (NO at S209), Server 2 updates the map data (S214). The map version at this time is Ver. 3. Next, Server 2 discards the backed-up map data (S215) and subsequently sets change management information = "invalid" (S216).

[0056] Subsequently, since the map data is updated every time a road change occurs, the vehicle navigation device 1 retrieves the guide route based on the updated data received from the server 2.

[0057] When the operations of the vehicle navigation device 1 and the server 2 described above are combined, the operations as shown in Fig. 8. Here, Fig. 8 a case where the updated data after work end is consistent with the saved card data, that is, when saved information = ON. 3. Operations for the vehicle navigation device 1 when a change in road conditions needs to be reflected after a working period (the map data in the vehicle navigation device 1 is not updated during the working period)

[0058] 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 is completed, the vehicle navigation device 1 receives response type = "Reuse Map" from the server 2 without saving the map data (NO at S409). Therefore, the map data described above is not available.

[0059] Here, when response type = "Reuse map" (NO at S409), when backed up information = OFF (NO at S413), the vehicle navigation device 1 updates the map version of its own map data without restoring the backed up map data (S415). The map version at this time is Ver. 2. In this case, since the map data remains the map data before the start of work and is the same as the update data after the end of work, the vehicle navigation device 1 can acquire the guidance route by continuously using the map data before the start of work.

[0060] According to an embodiment like this, the following effects can be obtained.

[0061] 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 receiving a confirmation request from the vehicle navigation device 1 regarding the updated data. The vehicle navigation device 1 executes map data update processing based on the confirmation result from the server 2. Thus, when the map data is determined to be the same as before the road work as a result of the temporary road work being completed, the backed-up map data saved before the road work can be restored and used. Accordingly, data communication between the vehicle navigation device 1 and the server 2 can be suppressed after the work is completed.Accordingly, the amount of data communication between the vehicle navigation device 1 and the server 2 can be reduced.

[0062] When response type = "Reuse map" and backed-up information = OFF, that is, when the vehicle does not pass the work section during the work period but passes it for the first time after the work is finished, the vehicle navigation device 1 can use its own map data from before the start of work as the latest map data instead of restoring the backed-up map data. Accordingly, similar to using the backed-up map data as described above, the amount of data communication between the vehicle navigation device 1 and the server 2 can be reduced.

[0063] The server 1 can appropriately determine the work section and the work duration and perform efficient processing by obtaining detailed information about the work section and the work duration as work information from the outside.

[0064] When updating map data, for map data update management, management is performed by assigning a map version in units of updates based on an update date or the like. However, when a reuse instruction regarding the backed-up data on the car navigation device 1 side or an instruction to use existing map data as it is is received from the server 2, only management information is updated to the latest information, and the map data on the car navigation device 1 side remains old. Therefore, consistency with other management information can be maintained. (Other embodiments)

[0065] The map data update method can be updated using communication through Wi-Fi or a medium such as USB in addition to communication through DCM.

[0066] Attributes when determining a map data match can be not only a shape such as road topography, but can also be road attributes such as a number of traffic lanes and regulations, and ground objects such as a roadside sign.

[0067] As a means of obtaining temporary road work information, in addition to official announcements, 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.

[0068] The on-board terminal is not limited to the vehicle's navigation device. A smartphone, tablet, or personal computer can be used.

[0069] Updating map data for automatic driving is also applicable.

[0070] The present disclosure is described based on the embodiments. However, it should be understood that the present disclosure is not limited to the embodiments and constructions. The present disclosure is intended to cover various modification examples and modifications within the range of equivalence. Moreover, in addition to the various combinations and configurations, other combinations and configurations including more, less, or only a single element are also within the spirit and scope of the present disclosure.

Claims

[1] Map update procedure, comprising: Sending by an on-board terminal (1) a confirmation request as to whether updated data, which is map data for updating, is available; in response to receiving the confirmation request of the on-board terminal (1), sending by a map update server (2) a confirmation result to enable the on-board terminal (1) to update map data in the on-board terminal (1); in response to the confirmation request of the on-board terminal (1) being received in a state where the updated data is available after the start of a temporary road change, distributing the updated data by a map update server (2) and sending the confirmation result by the map update server (2) to instruct the on-board terminal (1) to temporarily use the updated data; or in response to the confirmation request of the on-board terminal (1) being received in a state where the updated data is available after the end of a temporary road change, the map update server (2) sending the confirmation result to instruct the on-board terminal (1) to use the updated data from before the start of the temporary road change; in response to the confirmation result of the map update server (2) for instructing the on-board terminal (1) to temporarily use the updated data, temporarily using by the on-board terminal (1) the updated data that has already been distributed; and in response to the confirmation result of the map update server (2) for instructing the on-board terminal (1) to use the updated data from before the start of the temporary road change. Use by the on-board terminal (1) of the updated data using the map data from before the start of the temporary road change instead of the updated data. [2] The map updating method according to claim 1, further comprising: Instructing the on-board terminal (1) by the map update server (2) to back up the map data when the on-board terminal (1) is instructed to temporarily use the updated data; instructing the on-board terminal (1) by the map update server (2) to reuse the backed-up map data when the on-board terminal (1) is instructed to use the updated data from before the start of the temporary road change; Backing up by the on-board terminal (1) the map data from before the temporary road change in response to the map update server (2) instructing the on-board terminal (1) to back up the map data; and Restoring by the on-board terminal (1) the backed up map data in response to the map update server (2) instructing the on-board terminal (1) to reuse the map data. [3] The map updating method according to claim 2, further comprising: Continuing, by the on-board terminal (1), to use the map data from before the temporary road change in response to the map update server (2) instructing the on-board terminal (1) to reuse the map data without instructing the on-board terminal (1) to back up the map data. [4] A map updating method according to any one of claims 1 to 3, further comprising: Obtaining by the map update server (2) work information; and Setting, by the map update server (2), a state in which the acquiring unit acquires the work information as a state in which the temporary road change is started. [5] The map updating method according to claim 4, further comprising: Setting a status of management information to an invalid state by the map update server (2) in response to the management information being in an initial state, Setting the status of management information to a prepared state by the map update server (2) in response to the work information being acquired when the management information indicates the invalid state, in response to a road change occurring when the status of management information indicates the prepared state, updating the map data to the updated data and setting the status of management information to a secured state by the map update server (2), in response to a road change occurring when the status of management information indicates the secured state, updating the map data to the updated data, if the updated data matches the map data from before the temporary road change, setting the status of management information to a reusable state by the map update server (2), and if the updated data does not match the map data before the temporary road change, discarding the map data that is backed up and setting the status of management information to the invalid state by the map update server (2), and in response to a road change occurring when the status of management information indicates the reusable state, updating the map data to the updated data, discarding the backed up map data, and setting the status of management information to the invalid state by the map update server (2), and when a latest map is requested through the on-board terminal (1), Distributing the updated data to which a map version is added and instructing the on-board terminal (1) to update the map data by the map update server (2) when the status of management information indicates the invalid state, Instructing the on-board terminal (1) not to update the map data by the map update server (2) when the status of management information indicates the prepared state, Distributing the updated data to which a map version is added and instructing the on-board terminal (1) to back up the map data by the map update server (2) when the status of management information indicates the backed up state, and Instructing the on-board terminal (1) to reuse the map data and distributing the map version through the map update server (2) when the status of management information indicates the reusable state; and when the updated data is requested from the map update server (2), performing no operation by the on-board terminal (1) in response to being instructed not to update the map data, Updating the map data to the updated data distributed by the map update server (2) by the on-board terminal (1) in response to being instructed to update the map data, Backing up the map data and updating the map data to the updated data by the on-board terminal (1) in response to being instructed to back up the map data, and Restoring the backed up map data and updating its own map version by the on-board terminal (1) in response to being instructed to reuse the map data. [6] Map update server (2) that sends a confirmation result in response to a confirmation request of the on-board terminal (1) regarding whether updated data, which is map data for updating, is available and enables the on-board terminal (1) to update map data in the on-board terminal (1), wherein the on-board terminal (1) includes an on-board terminal-side update management unit (10a) which, in response to the confirmation result of the map update server (2) for instructing the on-board terminal (1) to temporarily use the updated data, temporarily uses the updated data that has already been distributed, and in response to the confirmation result of the map update server (2) for instructing the on-board terminal (1) to use the updated data from before a start of a temporary road change, uses the updated data using map data from before the start of the temporary road change instead of the updated data, wherein the map update server (2) comprises: a server-side update management unit (19a) that, in response to the confirmation request of the on-board terminal (1) being received in a state where the updated data is available after the start of a temporary road change, sends the confirmation result for distributing the updated data and instructing the on-board terminal (1) to temporarily use the updated data, or, in response to the confirmation request of the on-board terminal (1) being received in a state where the updated data is available after the end of a temporary road change, sends the confirmation result for instructing the on-board terminal (1) to use the updated data from before the start of the temporary road change. [7] An on-board terminal (1) that sends to a map update server (2) a confirmation request as to whether updated data, which is map data for updating, is available and enables map data to be updated in response to a confirmation result of the map update server (2), wherein the map update server (2) includes a server-side update management unit (19a) which, in response to the confirmation request of the on-board terminal (1) being received in a state in which the updated data is available after the start of a temporary road change, sends the confirmation result for distributing the updated data and instructing the on-board terminal (1) to temporarily use the updated data, or in response to the confirmation request of the on-board terminal (1) being received in a state in which the updated data is available after the end of a temporary road change, sends the confirmation result for instructing the on-board terminal (1) to use the updated data from before the start of the temporary road change, wherein the on-board terminal (1) comprises: an on-board terminal side update management unit (10a) that, in response to the confirmation result of the map update server (2) for instructing the on-board terminal (1) to temporarily use the updated data, temporarily uses the updated data that has already been distributed, and, in response to the confirmation result of the map update server (2) for instructing the on-board terminal (1) to use the updated data from before the start of a temporary road change, uses the updated data using map data from before the start of the temporary road change instead of the updated data.

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