To solve the problem that an illegal use can not be prevented when settlement is performed only by reporting a card number in the price settlement using a credit card.

This credit card settlement system has a code issue system for issuing (5) a temporary use code to the user of the credit card and registering (4) that code in response to communication (2) of a code issue application containing the card number and a password from the user of the credit card and a user confirmation system for confirming whether the settlement is requested from a regular user or not by collating the temporary use code in response to communication (7) of a user confirmation application containing the relevant temporary use code from a requested person receiving communication (6) of a price settlement request using the credit card with the temporary use code from the user and communicating (11) this user confirmed result or the like to the requested person.