JP2006244308A - On-vehicle unit for electronic toll collection system and its total amount calculation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To comply with a storage medium for managing a total amount in an on-vehicle unit for an electronic toll collection system. <P>SOLUTION: A transmission/receipt part 31 receives usage information corresponding to use of a service by a mounted IC card 20 through communication with an ETC gate 10. A storage device 39 stores total amounts of service usage fees in compliance with individually different IC cards 29. An ETC processing part 36 reads history information from the IC card 20 via an IC card interface 37 to identify the IC card 20 based on the history information. The ETC processing part 36 specifies a total amount corresponding to the IC card 20 from the storage device 38, and based on the specified total amount and the service usage fee included in the received usage information, updates the total amount corresponding to the IC card 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an in-vehicle unit for an automatic fee collection system and a method for calculating the integrated amount thereof.

2. Description of the Related Art Conventionally, an automatic fee collection system (for example, ETC) that automatically collects a service usage amount by communicating with a roadside device is known. For example, Patent Document 1 discloses an ETC in-vehicle unit that displays an accumulated amount of usage amount from the viewpoint of improving user convenience. The ETC in-vehicle unit is used with an IC card as a recording medium attached to the unit body in accordance with the use of the service.
JP 2004-265107 A

  However, the conventional in-vehicle unit simply manages the total amount related to the use of a series of services, and even if the users (that is, the recording media) are different, it has not been managed individually. .

  The present invention has been made in view of such circumstances, and an object thereof is to manage an integrated amount corresponding to a recording medium in an in-vehicle unit for an automatic fee collection system.

  In order to solve this problem, the in-vehicle unit for an automatic toll collection system according to the present invention includes an interface unit, a receiving unit, a storage unit, a recording medium identification unit, and a processing unit. The interface unit is attached according to the use of the service, and reads / writes data from / to a recording medium on which history information indicating a history of use of the service is recorded. The receiving means receives usage information corresponding to the use of the service by the mounted recording medium by communicating with the roadside device. The storage means individually stores the accumulated amount of the service usage amount corresponding to different recording media. The recording medium identification unit reads history information from the recording medium via the interface unit, and identifies the recording medium based on the history information. The processing means identifies the accumulated amount corresponding to the recording medium identified by the recording medium identifying means from the storage means, and determines the identified accumulated amount and the usage amount of the service included in the usage information received by the receiving means. Based on this, the accumulated amount corresponding to the recording medium is updated.

  According to the present invention, since the recording medium is identified based on the history information of the recording medium and the accumulated amount is recorded corresponding to the recording medium, the accumulated amount is individually managed corresponding to the recording medium. be able to.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of an automatic fee collection system 1. The automatic toll collection system 1 is an automatic toll collection system that automatically collects service usage fees by communicating with roadside devices. In this embodiment, the automatic toll collection system automatically pays tolls for toll roads. ETC (Electronic Toll Collection System). The ETC 1 includes an ETC gate 10 that is a roadside device, an IC card 20 as a recording medium, and an in-vehicle unit 30 for ETC.

  In the ETC 1, the usage status of the service related to the ETC gate 10 is stored in advance in the IC card 20 before the host vehicle passes through the ETC gate 10. That is, the entrance gate information is stored in the IC card 20 at the entrance gate of the toll road. When the host vehicle passes through the ETC gate 10, the in-vehicle unit 30 acquires service usage status, vehicle identification data (such as vehicle type) from the IC card 20, and transmits these to the ETC gate 10. In response to the transmission of the in-vehicle unit 30, the ETC gate 10 transmits a usage amount (for example, a toll), a usage date and time, a usage content (for example, a toll gate section), etc. as usage information corresponding to the use of the service. The in-vehicle unit 30 receives the usage information and stores the contents in the IC card 20, thereby completing a series of processes related to the service.

  The ETC gate 10 includes an ETC roadside antenna 11 and generates usage information such as a usage amount, a usage date, and usage contents when the host vehicle passes through the ETC gate 10. Then, the ETC gate 10 transmits the generated usage information to the in-vehicle unit 30 via the ETC roadside antenna 11.

  The IC card 20 includes a control processing unit (not shown) and a storage device 21. When the ETC 1 is used, the IC card 20 is mounted in a slot (not shown) of the in-vehicle unit 30 and used. The IC card 20 outputs various information to the in-vehicle unit 30 in response to a request from the in-vehicle unit 30 in a state where the IC card 20 is inserted into the slot of the in-vehicle unit 30. Therefore, the storage device 21 stores various types of information recognized as necessary for the operation of the system, such as vehicle identification data and history information. FIG. 2 is an explanatory diagram of history information stored in the storage device 21 of the IC card 20. As shown in the figure, the storage device 21 stores a history of past usage, for example, a list of usage information such as usage amount, usage date and time, and usage content in time series.

  The in-vehicle unit 30 includes a transmission / reception unit (reception unit) 31, a modulation / demodulation unit 32, a control unit 33, a display device (presentation unit) 34, a buzzer 35, and an ETC processing unit (recording medium identification unit and processing unit) 36. And an IC card interface (interface means) 37, a security module 38, a storage device (storage means) 39, and a power supply unit 40.

  The transmission / reception unit 31 includes the vehicle-mounted device side antenna 31 a, receives a signal transmitted from the ETC gate 10 by the vehicle-mounted device side antenna 31 a, and outputs this to the modem unit 32. In addition, the transmission / reception unit 31 transmits the signal output from the modulation / demodulation unit 32 to the ETC gate 10 from the vehicle-mounted device antenna 31a.

  The modem unit 32 demodulates the signal output from the transmission / reception unit 31 and outputs the demodulated signal to the control unit 33. Further, the modem unit 32 modulates the signal output from the control unit 33 and outputs the modulated signal to the transmission / reception unit 31.

  The control unit 33 performs communication control with the ETC gate 10. Specifically, the control unit 33 outputs the usage information given from the modem unit 32 to the ETC processing unit 36. Further, the control unit 33 outputs the vehicle identification data read from the IC card 20 by the ETC processing unit 36 to the modulation / demodulation unit 32.

  The display device 34 is controlled by an ETC processing unit 36, which will be described later, and displays the result of communication with the ETC gate and the accumulated amount of the usage amount. The display device 34 may be a display integrated with the in-vehicle unit 30 or an in-vehicle display that displays navigation information and the like as in the present embodiment. Therefore, in this embodiment, the display device 34 is electrically connected to the in-vehicle unit main body via the LAN transceiver 41. The display device 34 includes a display (display means) 34a, an operation switch (input means) 34b, and a drawing processing unit 34c.

  The display 34a is a known display such as a CRT or LCD. The operation switch 34b is a switch for operating the in-vehicle unit 30. In the present embodiment, the operation switch 34b is a touch panel type capable of performing an input operation on the display screen in accordance with information displayed on the display screen of the display device 34a. It is an operation switch (therefore, the display device 34 has not only a function as a display means but also a function as an input means). The drawing processing unit 34c outputs a drawing signal for drawing the processing signal (display information) output from the ETC processing unit 36 as an image on the display 34a to the display 34a. In addition, the drawing processing unit 34 c outputs operation information of the operation switch 34 b to the ETC processing unit 36.

  The buzzer 35 outputs the processing signal output from the ETC processing unit 36 as various buzzer sounds.

  The ETC processing unit 36 is a processing unit that executes various types of processing. In relation to this embodiment, the ETC processing unit 36 manages various amounts of accumulated usage amounts corresponding to the users (more precisely, the IC card 20). Execute the process. Specifically, the ETC processing unit 36 executes an integration process for calculating an integrated amount of the usage amount. Further, the ETC processing unit 36 controls the display device 34 to execute a display process for displaying the calculated integrated amount. Further, the ETC processing unit 36 can store the usage information transmitted from the ETC gate 10 in the storage device 39 and erase the information stored in the storage device 39 as necessary. Further, the ETC processing unit 36 outputs the usage information output from the control unit 33 to the security module 38 and outputs the information in the IC card 20 output from the security module 38 to the control unit 33.

  An IC card interface (hereinafter referred to as “IC card IF”) 37 is provided in a socket in which the IC card 20 is mounted, and reads / writes data with the IC card 20 in a contact / non-contact manner. The IC card IF 37 outputs the usage information output from the security module 38 to the IC card 20 and the ETC processing unit 36. Further, the IC card IF 37 outputs data transmitted to the ETC gate side such as vehicle identification data acquired from the IC card 20 to the security module 38, and records history information acquired from the IC card 20 to the ETC processing unit 36. Output for.

  The security module 38 encrypts the vehicle identification data and the like output from the IC card IF 37 and outputs this to the ETC processing unit 36. Further, the security module 38 decodes the usage information given from the ETC processing unit 36 and outputs it to the IC card IF 37.

  The storage device 39 is a device that stores various data, and stores individual integrated data groups corresponding to different IC cards 20 in relation to the present embodiment. FIG. 3 is an explanatory diagram of the individual integration data stored in the storage device 39 of the in-vehicle unit 30. Each individual integrated data is associated with fields for storing an integrated amount, usage date, usage content, and usage amount. The field corresponding to the use date and time holds the use date and time associated with the most recent service use related to the IC card 20. The field corresponding to the usage content holds the usage content (the toll gate section in this embodiment) associated with the latest service usage related to the IC card 20. In the field corresponding to the usage amount, the usage amount (the toll in this embodiment) associated with the latest service usage related to the IC card 20 is held. Each field included in the same usage information is held in each field related to usage date / time, usage details and usage amount, and past usage including the usage amount included in this usage information is stored in the field related to accumulated amount. The accumulated amount of money is held. In other words, this individual integration data holds the integration amount of the usage amount and the usage information corresponding to the usage amount for which the integration amount is calculated.

  The power supply unit 40 supplies power supplied from the power supply of the host vehicle to each component of the in-vehicle unit 30.

  Hereinafter, a series of processing procedures by the in-vehicle unit 30 when passing through the ETC gate 10 will be described. First, as a premise, when the vehicle passes through the ETC gate 10, the in-vehicle unit 30 receives usage information from the ETC gate 10. The transmission / reception part 31 will output this with respect to the modem part 32, if usage information is received via the onboard equipment side antenna 31a. The output usage information is demodulated by the modem unit 32 and then output to the control unit 33, and the control unit 33 outputs the demodulated usage information to the ETC processing unit 36. The ETC processing unit 36 outputs the usage information to the security module 38, whereby the usage information transmitted after being encrypted is decrypted by the security module 38. The security module 38 outputs the decrypted usage information (that is, usage amount and usage date) to the IC card IF 37.

  When the IC card IF 37 receives the usage information from the security module 38, it outputs it to the IC card 20. The control processing unit of the IC card 20 stores the acquired usage information in the storage device 21, whereby the IC card 20 has a new usage including the usage date, usage content, and usage amount as shown in FIG. 2. Information is recorded as history information.

  Further, when the IC card IF 37 receives the usage information from the security module 38, the IC card IF 37 outputs it to the ETC processing unit 36. Then, the ETC processing unit 36 controls the display device 34 so that the usage information, that is, the usage amount and the usage date and time are displayed on the display device 34a. Specifically, the ETC processing unit 36 outputs the usage amount and the usage date and time as display information to the drawing processing unit 34c, whereby the drawing processing unit 34c displays the usage amount and the usage date and time (or simply the usage amount). Only) is displayed on the display 34a.

  When a series of processes accompanying the passage of the ETC gate 10 is completed, the in-vehicle unit 30 executes an accumulation process for calculating an accumulated amount of the usage amount. Here, FIG. 4 is a flowchart illustrating a series of processing steps performed by the in-vehicle unit 30.

  First, in step 1, the ETC processing unit 36 reads history information from the IC card 20 via the IC card IF 37. That is, when the ETC processing unit 36 instructs the control processing unit of the IC card 20 to read the history information via the IC card IF 37, the control processing unit receives the history information from the storage device 21 of the IC card 20. read out. At this time, the control processing unit of the IC card 20 reads, for example, a list of past usage information of up to about 20 cases as history information (note that the previously recorded usage information may not be read). Output to the IC card IF. Then, the IC card IF 37 outputs this history information to the ETC processing unit 36.

  In step 2, the ETC processing unit 36 searches the storage device 39 based on the history information read from the IC card 20, and whether there is individual integration data that holds usage information corresponding to the read history information. Judge whether or not. When the IC card 20 currently mounted on the in-vehicle unit 30 has been used in the past in the in-vehicle unit 30 and is frequently used, the storage device 39 stores There is individual integration data that holds an integration amount according to usage and usage information. Therefore, in this step 2, the IC card 20 is identified by judging the correspondence between the history information of the IC card 20 and the usage information of each individual integrated data.

  If an affirmative determination is made in step 2, that is, if there is individual integration data corresponding to the history information, the process proceeds to step 3. In step 3, the ETC processing unit 36 reads out the corresponding individual integrated data from the storage device 39, and expands the contents in a work area (RAM (not shown)).

  On the other hand, if a negative determination is made in step 2, that is, if there is no individual integration data corresponding to the history information, the process proceeds to step 4. In step 4, the ETC processing unit 36 searches the storage device 39 based on the usage information, thereby specifying the individual integrated data holding the oldest usage date and time. In step 5, the ETC processing unit 36 clears the accumulated amount and usage information (usage date, usage content, and usage amount) held by the specified individual integration data, and then the content (that is, the accumulated amount). "0", usage information "none") is developed in the work area (RAM (not shown)).

  In Step 6 following Step 3 or Step 5, the ETC processing unit 36 calculates the integrated amount of the IC card 20 in consideration of the usage amount of the currently received usage information. Specifically, the ETC processing unit 36 newly calculates the accumulated amount based on the amount of utilization information and the accumulated amount stored in the read individual accumulated data, that is, by adding both. calculate. For example, if there is individual integration data corresponding to the IC card 20, the integration amount calculated in step 6 is the addition amount according to the current usage to the integration amount held by the individual integration data. Will be the amount of money. On the other hand, when the individual integrated data corresponding to the IC card 20 does not exist, the integrated amount calculated in step 6 is the integrated amount (“0”) held by the individual integrated data. This is the sum of the usage amount according to the current usage.

  In step 7, the ETC processing unit 36 determines whether usage information has been acquired. That is, when the user newly uses a service, since new usage information is transmitted from the ETC gate 10, an affirmative determination is made in step 7, and the process returns to step 6. In step 6, the integrated amount is calculated again by adding the acquired integrated amount and the previously calculated integrated amount. On the other hand, when the user is not newly using the service, new usage information is not transmitted, so a negative determination is made in step 7 and the process proceeds to step 8.

  In step 8, the ETC processing unit 36 determines whether or not the IC card 20 is inserted and ejected from the socket. If an affirmative determination is made in step 8, that is, if the IC card 20 is ejected, the process proceeds to step 10. On the other hand, if a negative determination is made in step 8, that is, if the IC card 20 remains attached, the process proceeds to step 9.

  In step 9, the ETC processing unit 36 determines whether or not the user has performed a power off operation. If an affirmative determination is made in step 9, that is, if the power is turned off, the process proceeds to step 10. On the other hand, if a negative determination is made in step 9, that is, if the power is still on, the process returns to step 7 and the above-described usage information acquisition determination is performed.

  In step 10, the ETC processing unit 36 stores the usage amount and usage information currently deployed in the work area in the corresponding individual integration data, and updates the previous information.

  In addition to such a series of integration processes, when the user requests display of the integrated amount at a certain timing, the in-vehicle unit 30 executes a display process for displaying the integrated amount together with the integrated period. Here, FIG. 5 is a flowchart showing the procedure of the display process.

  First, when the operation switch 34b is operated by the user and an input requesting the display of the accumulated amount of the used amount used by the user is made (used accumulated amount request), a signal corresponding to the requested accumulated amount request is issued from the operation switch 34b. The data is input to the drawing processing unit 34c (step 20). For example, the drawing processing unit 34c displays in advance a symbol or text character that prompts the display operation of the accumulated usage amount on a part of the display screen of the display 34a. Then, when the user touches this display location, a signal corresponding to the usage amount request is input to the drawing processing unit 34c. In step 21, the drawing processing unit 34 c outputs a signal corresponding to the usage amount request to the ETC processing unit 36.

  When the usage accumulated amount request is received from the drawing processing unit 34c, in step 22, the ETC processing unit 36 reads the current value of the accumulated amount developed in the work area.

  In step 23, the ETC processing unit 36 outputs the integrated amount as display information to the drawing processing unit 34c. In step 24, the drawing processing unit 34c displays the accumulated amount on the display 34a based on the display information output from the ETC processing unit 36.

  As described above, according to the present embodiment, the accumulated amount of the usage amount related to the use of the IC card 20 is individually stored in the storage device 39 according to the IC card 20. Then, the ETC processing unit 36 reads the history information from the attached IC card 20 and identifies the IC card 20 based on the history information, thereby specifying the accumulated amount corresponding to the IC card 20 from the storage device 39. . Accordingly, the ETC processing unit 36 updates the accumulated amount of the usage amount based on the identified accumulated amount and the usage amount of the service included in the received usage information. As described above, since the IC card 20 is identified based on the history information of the IC card 20 and the accumulated amount is individually recorded corresponding to the IC card 20, the accumulated amount is associated with the IC card 20. Can be managed individually.

  By the way, according to the ETC operation standard, the IC card 20 stores a unique number for identifying the card. Specifically, referring to “Appendix 3 List of ETC Data Items” in “ETC Application Interface Specification (Narrow Area Radio)” issued by the Road Welfare Society, the IC card 20 includes an individual IC card. IC card information indicating an identification number is recorded as contract information. As long as such an identification number is recorded on the IC card, it is conceivable that different IC cards 20 are individually recognized based on the contract information, and the integrated amount is managed in association with the IC card 20. However, in the operation of the ETC, the contract information including the IC card information indicating the individual identification number of the IC card 20 is not handled as input / output data between the IC card 20 and the ETC processing unit 36 (see: Issued by the Road Welfare Society, “ETC Onboard Equipment Specifications / Onboard Equipment Detailed Standards”). Therefore, the IC card 20 cannot be identified by this contract information.

  In this regard, according to the present embodiment, the IC card 20 is identified between the IC card 20 and the ETC processing unit 36 based on the history information handled as input / output data. The associated accumulated amount can be managed corresponding to the IC card 20. Thereby, the user's convenience can be improved.

  Further, according to the present embodiment, the storage device 39 of the in-vehicle unit 30 stores the individual accumulated data that holds the accumulated amount of the used amount in association with the usage information corresponding to the used amount for which the accumulated amount is calculated. These are stored in correspondence with different IC cards 20. On the other hand, the ETC processing unit 36 records the received usage information on the IC card 20 as history information. Thereby, the integrated amount and the IC card 20 can be associated with each other via the history information (usage information). That is, the ETC processing unit 36 searches the storage device 39 based on the history information read from the IC card 20, so that the ICC 20 determines the IC according to the correspondence between the history information of the IC card 20 and the individual integration information. The card 20 can be identified.

  Further, according to the present embodiment, the ETC processing unit 36 reads the corresponding individual integration data when the individual integration data corresponding to the history information exists, reads the usage amount of the received usage information, and reads The accumulated amount is newly calculated based on the accumulated amount stored in the individual accumulated data. Then, the ETC processing unit 36 updates the accumulated amount held by the individual accumulated data. Thereby, the accuracy of the individual accumulated amount stored in the storage device 39 can be maintained by updating the corresponding accumulated amount according to the use of the IC card 20. In addition, the ETC processing unit 36 updates the usage information held by the read individual integration data with the usage information. As a result, the association between the accumulated amount and the usage information is updated, so that the IC card 20 can be identified with high reliability.

  Furthermore, according to this embodiment, the usage information further includes the usage date and time of the service. In this case, when there is no individual integration data corresponding to the history information read from the IC card 20, the ETC processing unit 36 searches the storage device 39 based on the usage information to obtain the oldest usage date and time. Read the individual integrated data that holds. Then, the ETC processing unit 36 clears the accumulated amount of the usage amount held by the read individual integration data and the usage information, and uses the received usage information, which is the integration amount, in this individual integration data. Record the amount and usage information in association. As a result, when a new IC card 20 (or IC card 20 again after a certain period of time) is mounted, the oldest individual integrated data is rewritten with data for this IC card 20. Therefore, the storage capacity of the storage device 39 can be suppressed by limiting the number of pieces of individual integrated data.

  Note that if the upper limit number of the individual integrated data is set too low, the continuity of the integrated amount may not be maintained, so this number can be changed as appropriate according to the usage mode of the in-vehicle unit 30. That is, in the case where the same in-vehicle unit 30 is shared by many users (IC card 20), the upper limit number of the individual integrated data is set to a somewhat large value and shared by a small number of users (IC card 20). For example, the upper limit number of the individual integrated data is set to a small value to some extent.

  In the first or second embodiment described above, the accumulated amount is displayed to the user, but the present invention is not limited to this. For example, instead of the display device 34, an output device such as a speaker can be used, and the configuration can be arbitrarily selected as long as the information can be presented to the user.

1 is a configuration diagram of an automatic fee collection system 1. FIG. It is explanatory drawing of the history information stored in the memory | storage device 21 of IC card 20. FIG. It is explanatory drawing of the separate integration data which the memory | storage device 39 of the vehicle-mounted unit 30 memorize | stores. 4 is a flowchart showing a series of processing procedures by the in-vehicle unit 30. It is a flowchart which shows the procedure of a display process.

Explanation of symbols

1 ETC
DESCRIPTION OF SYMBOLS 10 ETC gate 11 ETC roadside antenna 20 IC card 21 Storage device 30 In-vehicle unit 31 Transmission / reception unit 32 Modulation / demodulation unit 33 Control unit 34 Display device 35 Buzzer 36 ETC processing unit 37 IC card interface 38 Security module 39 Storage device 40 Power supply unit 41 LAN transceiver

Claims (7)

In the in-vehicle unit for the automatic toll collection system that automatically collects the usage amount of the service by communicating with the roadside device,
Interface means for reading and writing data to and from a recording medium that is mounted in accordance with the use of the service and records history information indicating a history of use of the service;
Receiving means for receiving usage information corresponding to the use of the service by the mounted recording medium by communicating with the roadside device;
Storage means for storing an accumulated amount of the usage amount of the service corresponding to each of the different recording media;
Reading the history information from the mounted recording medium via the interface means, and a recording medium identification means for identifying the recording medium based on the history information;
The accumulated amount corresponding to the recording medium identified by the recording medium identifying unit is specified in the storage unit, and the identified accumulated amount and the usage amount of the service included in the usage information received by the receiving unit And an in-vehicle unit for an automatic toll collection system, characterized by comprising processing means for updating an accumulated amount corresponding to the recording medium. The storage means stores the accumulated amount of the used amount and the individual accumulated data associated with the usage information used to calculate the accumulated amount, corresponding to the different recording media,
The processing means records the usage information received by the receiving means via the interface means as the history information on the recording medium,
The recording medium identifying means searches the storage means based on history information read from the mounted recording medium, and the correspondence between the history information of the recording medium and the usage information of each individual integrated data The in-vehicle unit for an automatic fee collection system according to claim 1, wherein the recording medium is identified by determining   When the recording medium identifying unit determines that the individual integrated data corresponding to the history information of the recording medium exists, the processing unit reads the corresponding individual integrated data from the storage unit, A new integrated amount corresponding to the recording medium is calculated based on the integrated amount of the individual integrated data and the usage amount of the received usage information, and the integrated amount of the individual integrated data is updated. An in-vehicle unit for an automatic fee collection system according to claim 2. The usage information further includes a usage date and time of the service,
The processing means, when it is determined by the recording medium identification means that the individual integrated data corresponding to the history information of the recording medium does not exist, by searching the storage means based on the use date and time, Read the individual integration data that holds the oldest usage date and time, clear the integration amount of the usage amount held by the read individual integration data and the usage information, and then add the individual integration data to the individual integration data The in-vehicle unit for an automatic fee collection system according to claim 2, wherein the usage amount of the received usage information is stored in association with the usage information. In the in-vehicle unit for the automatic toll collection system that automatically collects the usage amount of the service by communicating with the roadside device,
By reading the history information indicating the usage history of the service from the recording medium loaded according to the use of the service and identifying the recording medium based on the history information, the service of the service by the loaded recording medium An in-vehicle unit for an automatic toll collection system characterized by managing the accumulated amount of usage according to usage. In the in-vehicle unit for the automatic toll collection system that automatically collects the usage amount of the service by communicating with the roadside device,
Interface means for reading and writing data to and from a recording medium that is mounted in accordance with the use of the service and records history information indicating a history of use of the service;
Receiving means for receiving usage information corresponding to the use of the service by the mounted recording medium by communicating with the roadside device;
Storage means for storing an accumulated amount of the usage amount of the service corresponding to each of the different recording media;
Reading the history information from the mounted recording medium via the interface means, and a recording medium identification means for identifying the recording medium based on the history information;
Processing means for specifying an accumulated amount corresponding to the recording medium identified by the recording medium identifying means in the storage means;
An in-vehicle unit for an automatic toll collection system, comprising: a presenting unit that presents the accumulated amount specified by the processing unit to a user. In the method for calculating the total amount of the in-vehicle unit for an automatic toll collection system that automatically collects the usage amount of the service by communicating with the roadside device,
A first step of receiving usage information corresponding to the use of the service by communicating with the roadside device;
A second step of reading the history information from a recording medium mounted according to the use of the service and recording history information indicating a history of use of the service;
A third step of identifying the recording medium based on history information read from the recording medium;
An accumulated amount corresponding to the recording medium identified in the third step is specified from storage means for storing the accumulated amount of the service usage amount corresponding to each of the different recording media, and the identified accumulated amount And a fourth step of updating an accumulated amount corresponding to the recording medium based on the amount and the amount of service usage included in the usage information received in the first step. A method for calculating the total amount of in-vehicle units for the toll collection system.

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