When a customer operates a terminal to send a request for a provision of a manual page to the center via the Internet, the center determines whether the customer who is accessing is a registered customer (user of a copier) based on the stored customer information. In a case where the customer who is accessing the center is a registered customer, the center automatically selects electronic manual file(s) for the copier being used by the customer concerned. And the center generates a manual page representing the content of the selected manual file so that the content of the manual file is noticeable rather than the other information. The center transmits the manual page to the terminal concerned.