CARD CHECKING METHOD AND SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a card checking method and a system capable of shortening the response time to be required for a check of a credit card at the time of using a card and executing an operation such as inquiry at a low communication cost. SOLUTION: The customer's data of a credit card inputted to a card terminal 100 are sent to a card center 400 through an ISDN communication network 300 as a user-user signal regulated by the specification of an ISDN user-network interface layer 3 and the center 400 executes processing such as the credit inquiry of the credit card, the check of a credit limit amount and sales data based on the received customer's card information and sends a user-user signal to the terminal. 100 through the network 300 as a processing result.