Information processor, terminal

Abstract

To provide an information processor and a terminal which prevent erroneous notification in an accident notification system for notifying occurrence of an accident.SOLUTION: In an accident notification system which is constituted of a server device 20 and a plurality of terminals 10-1 to 10-n (n is an integer greater or equal to 2), the server device includes: an accident notification acceptance part which accepts accident notification including accident determination information showing that it is determined that an accident occurs in a moving body and occurrence point information showing a point which is determined that the accident occurs from the moving body; a cancellation notification acceptance part which accepts cancellation notification for canceling the accident notification; and an area specification part which records the occurrence point information included in the accident notification cancelled by the cancellation notification and specifies a cancellation notification frequent occurrence point on the basis of the recorded occurrence point information.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an information processing device and a terminal device. [Background technology]

[0002] An accident notification system has been proposed that automatically notifies a server device of the occurrence of an accident when an accident occurs on a moving object such as a vehicle. In such an accident notification system, for example, a terminal device mounted on the vehicle detects an impact on the vehicle and determines whether an accident has occurred based on the magnitude of the detected impact (impact value). If it determines that an accident has occurred, the terminal device notifies an external server device by wireless communication of the fact that the accident has occurred and the location of the accident (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-266294 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional technology, when an impact of a certain level or more is detected, an accident is uniformly determined to have occurred and reported, which results in so-called "false alarms" in which an accident is reported even when no accident actually occurred. For example, false alarms tend to increase on roads where impacts are likely to occur due to unevenness of the road surface, curves, slopes, etc. On the other hand, if the reference value (threshold value) of the impact value for determining an accident is increased to prevent false alarms, there is a problem that accidents with weak impacts cannot be reported as accidents.

[0005] One example of the problem that the present invention aims to solve is the problem that a large number of false alarms may occur in an accident reporting system that reports the occurrence of an accident. [Means for solving the problem]

[0006] The invention described in claim 1 is characterized by including an accident notification receiving unit that receives an accident notification including accident determination information indicating that a mobile body has determined that an accident has occurred at the mobile body and occurrence location information indicating the location where the accident is said to have occurred; a cancellation notification receiving unit that receives a cancellation notification to cancel the accident notification; and an area identification unit that records the occurrence location information included in the accident notification canceled by the cancellation notification and identifies an area where cancellation notifications occur frequently based on the recorded occurrence location information.

[0007] The invention described in claim 8 is a terminal device mounted on a mobile body, characterized in that it comprises an accident determination unit that determines that an accident has occurred on the mobile body, a transmitting unit that transmits an accident notification including information on the location where the accident is said to have occurred in accordance with the determination of the accident determination unit, and a receiving unit that receives information on an area where cancellation notifications occur frequently where the accident notifications are frequently canceled.

[0008] The invention described in claim 14 is an information processing method executed by an information processing device having a notification receiving means and an area identification means, characterized by having the steps of: receiving an accident notification including accident determination information indicating that an accident has been determined to have occurred on the mobile body from the mobile body and occurrence location information indicating the location where the accident is said to have occurred; receiving a cancellation notification to cancel the accident notification; and recording the occurrence location information included in the accident notification canceled by the cancellation notification, and identifying an area where cancellation notifications occur frequently based on the recorded occurrence location information.

[0009] The invention described in claim 15 is an accident reporting method that is mounted on a mobile body and executed by a terminal device having an accident determination means, a transmitting means, and a receiving means, and is characterized by having the steps of: determining that an accident has occurred on the mobile body; transmitting an accident notification including information on the location where the accident is said to have occurred in response to the determination that an accident has occurred on the mobile body; and receiving information on an area where cancellation notifications are frequent and where there are many cancellation notifications of accidents.

[0010] The invention described in claim 16 is characterized in that it causes a computer to execute the steps of receiving an accident notification including accident determination information indicating that an accident has occurred to the mobile body and occurrence location information indicating the location where the accident is said to have occurred, receiving a cancellation notification to cancel the accident notification, recording the occurrence location information included in the accident notification canceled by the cancellation notification, and identifying an area where cancellation notifications occur frequently based on the recorded occurrence location information.

[0011] The invention described in claim 17 is characterized in that the computer executes the steps of determining that an accident has occurred in the mobile body, sending an accident notification including information on the location where the accident is said to have occurred in response to the determination that an accident has occurred, and receiving information on areas where cancellation notifications are frequent and where there are many cancellation notifications of accidents. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a block diagram showing the configuration of a terminal device and a server device. [Figure 2] FIG. 10 is a diagram schematically illustrating the relationship between the impact value and the vehicle speed and the impact threshold value. [Figure 3] 10 is a flowchart showing a processing operation of the terminal device. [Figure 4] 10 is a flowchart showing a processing operation of the server device; [Figure 5] 10 is a flowchart showing a processing operation of the terminal device. [Figure 6] 10 is a flowchart showing a processing operation of the terminal device. [Figure 7] 10 is a flowchart showing a processing operation of the server device; [Figure 8] 10 is a flowchart showing a processing operation of the terminal device. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of each embodiment and the accompanying drawings, substantially the same or equivalent parts are designated by the same reference numerals. [Example]

[0014] 1 is a block diagram showing the configuration of an accident notification system according to Example 1. The accident notification system includes a server device 20 and a plurality of terminal devices 10-1 to 10-n (n is an integer of 2 or more).

[0015] The terminal devices 10-1 to 10-n are navigation devices mounted on moving bodies such as vehicles (hereinafter simply referred to as vehicles), and perform wireless communication with the server device 20. Since the terminal devices 10-1 to 10-n each have the same configuration, the following will describe the configuration of the terminal device 10-1, and will omit a description of the configurations of the terminal devices 10-2 to 10-n.

[0016] The terminal device 10-1 has an output unit 11, an impact detection unit 12, a location information acquisition unit 13, an accident determination unit 14, a notification generation unit 15, an error determination unit 16, a transmission / reception unit 17, a memory unit 18, and an error determination frequent area approach determination unit 19.

[0017] The output unit 11 is composed of a display unit 11A and an audio output unit 11B. The display unit 11A is composed of a display panel such as a liquid crystal display, and has a function of displaying, for example, touch panel type buttons. The audio output unit 11B is composed of an audio output device such as a speaker.

[0018] The impact detection unit 12 is configured by, for example, an acceleration sensor, and detects the magnitude of an impact that has occurred on the vehicle as an impact value G (hereinafter simply referred to as impact value) based on a change in the acceleration of the vehicle.

[0019] The location information acquisition unit 13 is configured by, for example, a GPS (Global Positioning System) sensor, and acquires location information indicating the current location of the vehicle. For example, the location information acquisition unit 13 receives radio waves transmitted from multiple GPS satellites and calculates the distance from each GPS satellite based on the received radio waves to acquire the location information.

[0020] The accident determination unit 14 determines that an accident has occurred when the impact value detected by the impact detection unit 12 is equal to or greater than a threshold value.

[0021] The notification generation unit 15 generates an accident notification including information on the impact value of the detected impact and the vehicle's traveling speed and location when the impact was detected, in accordance with the accident determination by the accident determination unit 14. Furthermore, the notification generation unit 15 generates a cancellation notification for canceling the accident notification when the error determination unit 16 determines that the accident determination is incorrect.

[0022] The error determination unit 16 determines whether or not the accident determination by the accident determination unit 14 is incorrect. For example, after the impact detection unit 12 detects an impact equal to or greater than a threshold, the error determination unit 16 determines whether or not the vehicle is running normally based on whether or not the vehicle has run a predetermined distance in a predetermined time, and if it determines that the vehicle is running normally, determines that the accident determination is incorrect.

[0023] Furthermore, the error determination unit 16 displays a touch panel type cancel button on the display unit 11A of the output unit 11 during a predetermined cancellation acceptance time, and accepts cancellation of the accident notification based on the driver's decision. When the cancel button is operated, the error determination unit 16 determines that the accident determination is an error.

[0024] The transmitting / receiving unit 17 transmits the accident notification generated by the notification generating unit 15 to the server device 20. After transmitting the accident notification to the server device 20, if the error determining unit determines that the accident determination is an error, the transmitting / receiving unit 17 transmits a cancellation notification to the server device 20.

[0025] Furthermore, the transmitting / receiving unit 17 receives from the server device 20 information on the impact threshold value used by the accident determination unit 14 for determining an accident and information on an area where erroneous determination is likely to occur.

[0026] The storage unit 18 stores various information received by the transmitting / receiving unit 17, including information on the impact threshold and the area where erroneous determinations frequently occur.

[0027] The erroneous judgment frequent area approach determination unit 19 determines whether or not the vehicle is approaching an erroneous judgment frequent area (i.e., whether or not the vehicle will enter the erroneous judgment frequent area within a predetermined reference time) based on the information about the erroneous judgment frequent area stored in the storage unit 18 and the position information acquired by the position information acquisition unit 13. Then, the erroneous judgment frequent area approach determination unit 19 causes the output unit 11 to output the determination result.

[0028] Specifically, when it is determined that the vehicle is approaching an erroneous judgment frequent area, the erroneous judgment frequent area approach determination unit 19 displays, for example, a message on the screen of the display unit 11A notifying the driver that the vehicle is approaching an erroneous judgment frequent area and urging the driver to pay attention (e.g., "XX m ahead, point where false accident reports are frequent. Please drive carefully.") Furthermore, the erroneous judgment frequent area approach determination unit 19 outputs, to the audio output unit 11B, a voice message corresponding to the message to be displayed on the display unit 11A.

[0029] The server device 20 includes a transmitting / receiving unit 21, a notification receiving unit 22, an accident processing unit 23, an erroneous judgment frequent area specifying unit 24, a threshold calculation unit 25, and a storage unit .

[0030] The transmitter / receiver 21 transmits and receives information data to and from the terminal devices 10-1 to 10-n, and receives accident notifications and cancellation notifications. The transmitter / receiver 21 also transmits information on impact thresholds and erroneous judgment frequent areas used by the terminal devices 10-1 to 10-n for accident judgment to the terminal devices 10-1 to 10-n.

[0031] The notification receiving unit 22 receives accident notifications and cancellation notifications from the terminal devices 10-1 to 10-n via the transmitting / receiving unit 21. The notification receiving unit 22 acquires the impact detection position, vehicle speed information, and impact value information included in the accident notification, and stores them in the storage unit 26.

[0032] When the notification receiving unit 22 receives an accident notification and the cancellation notification is not received within a predetermined cancellation time, the accident processing unit 23 performs processing to establish voice communication between an operator terminal (not shown) used by an operator and the terminal device that sent the accident notification, and processing to notify the police station or fire station of the occurrence of the accident together with the location information (hereinafter, these are collectively referred to as accident processing). In the voice communication between the operator terminal and the terminal device, for example, the operator asks questions and the driver responds to them.

[0033] The erroneous judgment frequent area identifying unit 24 identifies an area containing many detection positions where accident notifications have been canceled as an erroneous judgment frequent area based on information on the impact detection position included in the accident notifications (canceled accident notifications and non-canceled accident notifications) received by the notification receiving unit 22. For example, for each area of ​​a certain area (e.g., an area of ​​50 m square), the erroneous judgment frequent area identifying unit 24 calculates a cancellation rate, which is the ratio of the number of accident notifications canceled by cancellation notifications to the number of accepted accident notifications, and identifies an area with a high cancellation rate as an erroneous judgment frequent area. Note that the erroneous judgment frequent area identifying unit 24 does not calculate a cancellation rate for an area where the number of accepted accident notifications does not meet a predetermined standard value (i.e., an area with a small number of accident notification samples), and does not identify the area as an erroneous judgment frequent area.

[0034] The threshold calculation unit 25 calculates a reference value for the impact value based on the accident notification and cancellation notification received by the notification reception unit 22, and sets the impact threshold value used by the terminal devices 10-1 to 10-n for determining an accident.

[0035] 2(a) to 2(c) are diagrams showing the relationship between the threshold and the traveling speed and the impact value. The shaded area in the diagram indicates the range above the threshold (i.e., the range in which it is determined that an accident has occurred). Since the impact on a vehicle generally increases as the traveling speed of the vehicle increases, the impact threshold used for accident determination is generally determined according to the traveling speed as shown in FIG. 2(a). The threshold calculation unit 25 modifies this using a statistical method to set an impact threshold appropriate for the region (i.e., a threshold to be applied to each region).

[0036] When a predetermined number or more of accident notifications are received by the notification receiving unit 22 and stored in the memory unit 26, the threshold calculation unit 25 calculates a reference impact value based on the impact value and driving speed included in the accident notification, and sets the impact threshold. For example, the threshold calculation unit 25 sets the impact threshold by calculating the standard deviation of how the impact values ​​are distributed within a certain speed range.

[0037] 2(b) is a diagram showing an example of how accident notifications (accident notifications that were not canceled and accident notifications that were canceled) are distributed with respect to impact values ​​and driving speeds. Based on this distribution, the threshold calculation unit 25 sets an impact threshold so that the minimum impact value (the minimum impact value according to the driving speed) among the impact values ​​included in the accident notifications that were not canceled is included in a range equal to or greater than the threshold (i.e., a range in which an accident is determined to have occurred), as shown in FIG. 2(c).

[0038] The memory unit 26 accumulates and stores information regarding accident notifications and cancellation notifications received by the notification receiving unit 22, the impact threshold set by the threshold calculation unit 25, and the areas where erroneous judgments are likely to occur identified by the erroneous judgments-prone area identifying unit 24.

[0039] Next, the operation of the accident notification process executed by the server device 20 and the terminal devices 10-1 to 10-n will be described with reference to the flowcharts of Figures 3 to 5. Note that a description of the threshold calculation process executed by the threshold calculation unit 25 of the server device 20 will be omitted.

[0040] First, a first processing operation performed by terminal devices 10-1 to 10-n will be described with reference to the flowchart in Fig. 3. In the following description, one of terminal devices 10-1 to 10-n will also be simply referred to as terminal device 10.

[0041] The impact detection unit 12 of the terminal device 10 determines whether an impact equal to or greater than a threshold is detected (step S101). If an impact equal to or greater than the threshold is detected, the accident determination unit 14 determines that an accident has occurred (step S102).

[0042] The notification generation unit 15 generates an accident notification including location information indicating the location of the vehicle when the impact was detected, the vehicle speed, and information on the impact value of the detected impact. The transmission / reception unit 17 transmits the accident notification generated by the notification generation unit 15 to the server device 20 (step S103).

[0043] The error determination unit 16 determines whether the accident determination was an error (step S104). Specifically, the error determination unit 16 determines that the accident determination was an error if the vehicle has traveled a predetermined distance within a predetermined time and the driver has operated the cancel button. On the other hand, if the vehicle has stopped without traveling the predetermined distance and the cancel button has not been operated, the error determination unit 16 determines that the accident determination was not an error.

[0044] If it is determined that the accident determination is not an error, the terminal device 10 ends the process. On the other hand, if it is determined that the accident determination is an error, the notification generation unit 15 of the terminal device 10 generates a cancellation notification for canceling the accident notification. The transmission / reception unit 17 transmits the cancellation notification to the server device 20 (step S105).

[0045] Next, the processing operation of the server device 20 will be described with reference to the flowchart of FIG.

[0046] The notification receiving unit 22 determines whether or not an accident notification has been received (whether or not the transmitting / receiving unit 21 has received the accident notification) (step S201). If it is determined that an accident notification has been received, the notification receiving unit 22 determines whether or not a cancellation notification has been received within a predetermined time (whether or not the transmitting / receiving unit 21 has received the cancellation notification) (step S202).

[0047] If it is determined that the cancellation notice has not been received within the predetermined time, the notice receiving unit 22 supplies accident notice reception information indicating that the accident notice has been received to the accident processing unit 23. The accident processing unit 23 executes predetermined accident processing (step S203).

[0048] On the other hand, if it is determined that the cancellation notice has been received within the predetermined time, the notice receiving unit 22 cancels the received accident notice (step S204).

[0049] The notification receiving unit 22 acquires information on the impact detection location, vehicle speed, and impact value contained in the accident notification (canceled accident notification and non-canceled accident notification) (step S205), and stores them in the memory unit 26.

[0050] The erroneous judgment frequent area identification unit 24 calculates the cancellation rate of accident notifications in a predetermined area (e.g., an area of ​​50 m square) including the detection position based on the information on the detection position, vehicle speed, and impact value for past accident notifications stored in the memory unit 26 (step S206).

[0051] The erroneous judgment frequent area specifying unit 24 determines whether the calculated cancellation rate is equal to or greater than a predetermined value (step S207). If the cancellation rate is not equal to or greater than the predetermined value, the server device 20 ends the process. On the other hand, if it is determined that the cancellation rate is equal to or greater than the predetermined value, the erroneous judgment frequent area specifying unit 24 updates the information on the erroneous judgment frequent area stored in the storage unit 26. The transmitter / receiver 21 transmits the updated information on the erroneous judgment frequent area to the terminal devices 10-1 to 10-n (step S208).

[0052] Separately from the processes of steps S207 and S208, when the cancellation rate in a region that has been determined to be an erroneous judgment-prone region falls below a predetermined value, erroneous judgment-prone region specifying unit 24 excludes the region from the erroneous judgment-prone region and updates the information on erroneous judgment-prone regions stored in storage unit 26. Transmission unit 21 transmits the updated information on erroneous judgment-prone regions to terminal devices 10-1 to 10-n.

[0053] Next, the second processing operation performed by terminal devices 10-1 to 10-n will be described with reference to the flowchart of FIG.

[0054] The transmitting / receiving unit 17 determines whether or not information on an erroneous judgment frequent area has been received from the server device 20 (step S301). If it determines that information on an erroneous judgment frequent area has been received, the transmitting / receiving unit 17 updates the information on an erroneous judgment frequent area stored in the storage unit 18 (step S302).

[0055] The error judgment frequent area approach determination unit 19 determines whether the vehicle will enter the error judgment frequent area within a predetermined reference time based on the information on the error judgment frequent area and the current location information acquired by the location information acquisition unit 13 (step S303).

[0056] If it is determined that the vehicle will not enter the erroneous judgment frequent area within the predetermined reference time, the terminal device 10 ends the processing. On the other hand, if it is determined that the vehicle will pass through the erroneous judgment frequent area within the predetermined reference time, the output unit 11 notifies the driver that the vehicle is approaching the erroneous judgment frequent area (step S304). For example, the display unit 11A displays a message that the vehicle is approaching the erroneous judgment frequent area and urges the driver to be careful, and the audio output unit 11B outputs a corresponding audio message.

[0057] As described above, in the accident notification system of this embodiment, a terminal device that detects an impact equal to or greater than a threshold transmits an accident notification to a server device. The terminal device then determines whether the accident determination was incorrect, and if it is determined to be incorrect, transmits a cancellation notification to the server device. Based on the received accident notification and cancellation notification, the server device updates information about areas where misjudgment is frequent, indicating areas where accident notifications are frequently canceled, and transmits the updated information about areas where misjudgment is frequent to the terminal device.

[0058] According to the accident notification system of this embodiment, the server device can identify areas where accident notification cancellations are frequent (areas where erroneous judgments occur frequently) based on the accident notifications and cancellation notifications sent from the terminal devices. Therefore, when an accident notification is made, it is possible to appropriately handle the accident based on information about the areas where erroneous judgments occur frequently.

[0059] The server device also calculates a reference impact value based on the impact detection position, vehicle speed, impact value, and other information contained in the accident notification (canceled and undone accident notification), and sets the impact threshold value used by the terminal device for accident determination. Therefore, the reference threshold value for determining whether an accident has occurred can be changed depending on the road shape, vehicle speed, etc., making it possible to prevent erroneous accident determination.

[0060] The terminal device also receives information about areas where erroneous judgments are likely to occur from the server device. Therefore, a driver of a vehicle equipped with the terminal device can avoid large impacts by, for example, slowing down when passing through an area where erroneous judgments are likely to occur, based on the information about the area where erroneous judgments are likely to occur, thereby preventing erroneous judgments about accidents. [Example]

[0061] The accident notification system of this embodiment has substantially the same configuration as the accident notification system of embodiment 1 shown in Figure 1, but differs from the accident notification system of embodiment 1 in the operation of the notification generation unit 15 and the transmission / reception unit 17 of the terminal devices 10-1 to 10-n and the operation of the transmission / reception unit 21 and the notification reception unit 22 of the server device 20.

[0062] The notification generation unit 15 generates an accident notification including information on the impact value of the detected impact, and the vehicle's traveling speed and location when the impact was detected, in accordance with the accident determination by the accident determination unit 14. Furthermore, when the error determination unit 16 determines that the accident determination is incorrect, the notification generation unit 15 generates an incorrect determination notification indicating that an incorrect determination has been made. The incorrect determination notification includes location information of the point where the impact was detected, information on the vehicle's speed, information on the impact value, and information indicating that the impact was not caused by an accident.

[0063] The transmitter / receiver unit 17 transmits the accident notification to the server device 20 when an accident notification is generated by the notification generation unit 15 and the error determination unit does not determine that the accident judgment is incorrect within a predetermined time (e.g., 20 seconds) (i.e., when the accident judgment is not canceled).

[0064] On the other hand, if the error determination unit 16 determines that the accident determination is incorrect within a predetermined time after the accident determination unit 14 determines that an accident has occurred, an incorrect determination notice is sent to the server device 20 instead of an accident notification. That is, in the accident reporting system of this embodiment, if the error determination unit 16 determines that the accident determination is incorrect, an accident notification is not sent to the server device 20, and only an incorrect determination notice is sent to the server device 20.

[0065] The transmitting / receiving unit 21 of the server device 20 transmits and receives information data to and from the terminal devices 10-1 to 10-n, and receives accident notifications and erroneous determination notifications. Note that the terminal devices 10-1 to 10-n selectively transmit accident notifications or erroneous determination notifications in accordance with the determination of the error determination unit 16, so the transmitting / receiving unit 21 of the server device 20 receives either the accident notification or the erroneous determination notification.

[0066] The notification receiving unit 22 receives either an accident notification or an erroneous determination notification from the terminal devices 10-1 to 10-n via the transmitting / receiving unit 21. The notification receiving unit 22 acquires the impact detection position, vehicle speed information, and impact value information contained in the accident notification or the erroneous determination notification, and stores them in the storage unit 26.

[0067] The erroneous judgment frequent area specifying unit 24 counts the number of erroneous judgments per area of ​​a certain size (for example, an area of ​​50 m square) based on the information on the detected position of the impact included in the erroneous judgment notification stored in the storage unit 26. Then, the erroneous judgment frequent area specifying unit 24 specifies, as an erroneous judgment frequent area, an area where the number of erroneous judgments is equal to or greater than a predetermined number.

[0068] Next, the operation of the accident notification process executed by the server device 20 and the terminal devices 10-1 to 10-n of this embodiment will be described with reference to the flowcharts of Figures 6 to 8. Note that a description of the threshold calculation process executed by the threshold calculation unit 25 of the server device 20 will be omitted.

[0069] First, a first processing operation performed by the terminal devices 10-1 to 10-n will be described with reference to the flowchart in Fig. 6. In the following description, one of the terminal devices 10-1 to 10-n will also be simply referred to as the terminal device 10.

[0070] The impact detection unit 12 of the terminal device 10 determines whether an impact equal to or greater than a threshold has been detected (step S401). If an impact equal to or greater than the threshold has been detected, the accident determination unit 14 determines that an accident has occurred (step S402). The notification generation unit 15 generates an accident notification including location information indicating the location of the vehicle when the impact was detected, the vehicle speed, and information on the impact value of the detected impact.

[0071] The error determination unit 16 determines whether the accident determination was an error (step S403). If the vehicle has traveled a predetermined distance within a predetermined time and the driver has operated the cancel button, the error determination unit 16 determines that the accident determination was an error. On the other hand, if the vehicle has stopped without traveling the predetermined distance and the cancel button has not been operated, the error determination unit 16 determines that the accident determination was not an error.

[0072] If it is determined that the accident determination is not an error, the transmitting / receiving unit 17 transmits the accident notification generated by the notification generating unit 15 to the server device 20 (step S404).

[0073] On the other hand, if it is determined that the accident determination is incorrect, the notification generator 15 generates an incorrect determination notification including location information indicating the location of the vehicle when the impact was detected, the vehicle speed, and the impact value of the detected impact. The transmitter / receiver 17 transmits the incorrect determination notification to the server device 20 (step S405).

[0074] Next, the processing operation of the server device 20 will be described with reference to the flowchart of FIG.

[0075] The notification receiving unit 22 determines whether or not the accident notification transmitted from the terminal device 10 has been received (whether or not the transmission / reception unit 21 has received the accident notification) (step S501). If it is determined that the accident notification has been received, the notification receiving unit 22 supplies accident notification reception information indicating that the accident notification has been received to the accident processing unit 23. The accident processing unit 23 executes a predetermined accident process (step S502).

[0076] On the other hand, if it is determined that an accident notification has not been received, the notification receiving unit 22 determines whether or not an erroneous determination notification has been received (whether or not the transmitting / receiving unit 21 has received an erroneous determination notification) (step S503).

[0077] When it is determined that an erroneous determination notification has been received, the erroneous determination frequent area specifying unit 24 counts the erroneous determination notification as an erroneous determination at the detection position based on the information of the detection position included in the erroneous determination notification (step S504). The counted erroneous determination notifications are stored in the storage unit 26.

[0078] The erroneous judgment frequent area specifying unit 24 determines whether the number of erroneous judgments in a predetermined range of area (for example, an area of ​​50 m square) including the detection position is equal to or greater than a predetermined number (step S505), based on the information on the detection position, vehicle speed, and impact value for past erroneous judgment notifications stored in the storage unit 26. If the number of erroneous judgments is less than the predetermined number, the server device 20 ends the process.

[0079] If the number of erroneous determinations is equal to or greater than a predetermined number, the erroneous determination frequent area specifying unit 24 updates the information on the erroneous determination frequent area stored in the storage unit 26. The transmitting / receiving unit 21 transmits the updated information on the erroneous determination frequent area to the terminal devices 10-1 to 10-n (step S506).

[0080] Next, the second processing operation performed by terminal devices 10-1 to 10-n will be described with reference to the flowchart of FIG.

[0081] The transmitter / receiver 17 determines whether or not information on an erroneous judgment frequent area has been received (step S601). If it determines that information on an erroneous judgment frequent area has been received, the transmitter / receiver 17 updates the information on an erroneous judgment frequent area stored in the storage unit 18 (step S602).

[0082] The error judgment frequent area approach determination unit 19 determines whether the vehicle will enter the error judgment frequent area within a predetermined reference time based on the information on the error judgment frequent area and the current location information acquired by the location information acquisition unit 13 (step S603).

[0083] If it is determined that the vehicle will not enter the erroneous judgment frequent area within the predetermined reference time, the terminal device 10 ends the processing. On the other hand, if it is determined that the vehicle will pass through the erroneous judgment frequent area within the predetermined reference time, the output unit 11 notifies the driver that the vehicle is approaching the erroneous judgment frequent area (step S604). For example, the display unit 11A displays a message that the vehicle is approaching the erroneous judgment frequent area and urges the driver to be careful, and the audio output unit 11B outputs a corresponding audio message.

[0084] As described above, in the accident notification system of this embodiment, when a terminal device detects an impact equal to or greater than a threshold, the terminal device determines that an accident has occurred and generates an accident notification. The terminal device then determines whether the determination that an accident has occurred is erroneous, and transmits an accident notification if it is determined to be erroneous, or an erroneous determination notification if it is determined to be erroneous. The server device updates information about erroneous determination-prone areas, which indicate areas where erroneous determinations are frequent in the accident notification, based on the received accident notification and erroneous determination notification, and transmits the updated information about erroneous determination-prone areas to the terminal device.

[0085] According to the accident notification system of this embodiment, the server device can identify areas where there are many erroneous accident determinations (areas where erroneous determinations frequently occur) based on the accident notification and erroneous determination notification sent from the terminal device. Therefore, when an accident notification is received, it is possible to appropriately handle the accident based on the information about the erroneous determination frequent area. Furthermore, based on the information about the erroneous determination frequent area, it is possible to change the criteria (e.g., impact threshold) for determining whether an accident has occurred in the terminal device, thereby making it possible to prevent erroneous accident determinations.

[0086] The terminal device also receives information about areas where erroneous judgments are likely to occur from the server device. Therefore, a driver of a vehicle equipped with the terminal device can avoid large impacts by, for example, slowing down when passing through an area where erroneous judgments are likely to occur, based on the information about the area where erroneous judgments are likely to occur, thereby preventing erroneous judgments about accidents.

[0087] It should be noted that the embodiments of the present invention are not limited to those shown in the above examples. For example, in the above examples, an example was described in which an impact value (G) is detected based on a change in acceleration to determine whether an accident has occurred. However, the method of determining whether an accident has occurred is not limited to this. For example, it may be possible to determine whether an accident has occurred based on the characteristics of an impact sound when a vehicle is impacted.

[0088] In the above embodiment, the output unit of the terminal device notifies the user that the vehicle is approaching an erroneous judgment frequent area by displaying a message on the screen of the display unit and outputting a voice message from the voice output unit. However, the output unit does not necessarily have to perform both the screen display and the voice output, and may notify the user by a method other than the screen display and the voice output.

[0089] In the above-described first embodiment, the erroneous judgment-prone area specifying unit of the server device 20 calculates the cancellation rate of accident notifications to specify the erroneous judgment-prone area. However, the erroneous judgment-prone area specifying unit may specify an area with a large number of cancellations as the erroneous judgment-prone area without calculating the cancellation rate.

[0090] In the second embodiment, the erroneous judgment frequent area specifying unit of the server device 20 counts the erroneous judgment notifications and specifies an area with many erroneous judgments as an erroneous judgment frequent area. However, the erroneous judgment frequent area specifying unit may calculate the ratio of erroneous judgment notifications to accident notifications and specify an area with a high rate of erroneous judgments as an erroneous judgment frequent area.

[0091] Furthermore, the series of processes described in each of the above embodiments can be performed by computer processing in accordance with a program stored in a recording medium such as a ROM. [Explanation of symbols]

[0092] 10-1 to 10-n terminal devices 11 Output section 11A Display section 11B Audio output section 12 Impact detection unit 13 Location information acquisition section 14 Accident Judgment Department 15 Notification generator 16 Error detection unit 17 Transmitter / Receiver 18 Memory section 19. Area approach judgment unit where false judgments frequently occur 20 Server device 21 Transmitter / receiver 22 Notification Reception Department 23 Accident Treatment Department 24. False positive region identification unit 25 Threshold calculation unit 26 Memory section

Claims

[Claim 1] an accident notification receiving unit that receives an accident notification including accident determination information indicating that an accident has occurred on the moving body from the moving body and occurrence location information indicating a location where the accident is determined to have occurred; a cancellation notification receiving unit that receives a cancellation notification for canceling the accident notification; an area specifying unit that records occurrence location information included in the accident notification canceled by the cancellation notification, and specifies an area where cancellation notifications frequently occur based on the recorded occurrence location information; 10. An information processing device comprising:

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