CREDIT CARD SETTLEMENT METHOD, ITS DEVICE, CARD MANAGEMENT DEVICE, AND CARD USAGE LIMIT AMOUNT MANAGEMENT METHOD

摘要

PROBLEM TO BE SOLVED: To lower a risk of a card company. SOLUTION: This card management device 21 is provided with a receiving means receiving transaction approval request information transmitted from a card usage information input device 32, a first authorizing part 213 retrieving user information by using a credit card identifier included in the transaction approval request information as a key and determining whether a credit card is valid or not, a second authorizing part 213 retrieving usage limit amount information matching the credit card identifier by using the credit card identifier as a key and determining whether the credit card transaction is allowed or not on the basis of the transaction approval request information and the usage limit amount information, a usage limit amount management part 212 updating sales amount information if the credit card transaction is approved by the first and second authorizing parts and updating the usage limit amount information on the basis of the updated sales amount information, and a transmission part transmitting the updated usage limit amount information to the card usage information input device 23.