To always perform parking service regardlessly of the business hour of a shop in the case of adjusting parking charge by providing a means for adjusting parking charge based on the transaction using actual record that a customer transacts and uses by using a transaction processor at the time of the adjustment of parking charge.

When a customer adjusts parking charge, the parking charge is adjusted based on the transaction using actual record of the customer up to the present that the customer transacts and uses by using a transaction processor. Namely, the ATM 51 of a shop 44 is made to have a parking ticket data processing function receiving a parking ticket 45 and processing data. The parking ticket 45 issued in a parking ticket issuing machine 12 is inserted into the ATM 51, parking service information is recorded. At the time of the adjustment of parking charge, the parking service information recorded in this parking ticket 45 is made to be read and the adjustment to which parking service such as the extension of parking time and the discount of parking charge, etc., is added is made to be performed.