An on-vehicle automatic charging apparatus 10 obtains its own position information from GPS signals from GPS satellites 51 to 53, determines on the basis of the position information whether conditions for charging are satisfied, and subtracts a calculated charge amount from an inserted prepaid car, when the conditions for charging are satisfied. At this time, information used for calculation of the charge amount is written into the prepaid card as a charge record. When the prepaid card is inserted into a card issuing machine 20 in order to increase the balance, the card issuing machine 20 reads the written charge record and transmits it to a center computer 30. The center computer 30 distributes the charge amount to management companies on the basis of the charge record.