PURPOSE: To facilitate a rewriting process for information regarding the payment of a toll, etc., that is held inside and effectively utilize the information other than the toll while surely preventing vehicle kind information from being carried out of the vehicle.
CONSTITUTION: The vehicle kind information on a vehicle on which the transponder is installed, held by a vehicle kind information holding means 67aA provided so that it can not be carried out of the vehicles is read out by an on-vehicle information read means 79A and transmitted by radio to an interrogator 29 installed at a gate on a travel road, and information on the toll calculated on the basis of the vehicle kind information, etc., is received by radio from the interrogator 29 and the contents of electronic cash information held by the electronic cash information holding means 81a of a transponder main body 70 mounted detachably on the vehicle are updated by an electronic cash information update means 79B according to the toll in the toll information received by radio from the interrogator 29.
INOUE YASUSHI
KORENAGA HIDENOBU
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