On receiving from a personal computer (1) a request for transmitting data for displaying a picture for inputting a user's profile in association with an MGID and an APID for specifying the personal computer (1), an EMD registration server (3) selects data recorded in correspondence to the APID based on the received APID and transmits the selected data to the personal computer (1). The EMD registration server (3) receivers the user's profile inputted based on the data from the personal computer (1) and records the user's profile in correspondence to the MGID.