To provide a system which mediates between a user and a plurality of credit companies, banks, etc., to control personal information together.

The user performs a modification procedure for user information from a user terminal 10 to a agent center server 20, which sends modified user information to servers 30, 40, 50, and 60 of a service providing company, so that registered information modification is reported to the service providing company at a time. Further, the user performs a procedure for reporting card loss from the user terminal 10 to the agent center server 20, which sends a card loss report to the servers 30, 40, 50, and 60 together with the user information, so that the card loss is reported to the service providing company at a time.