A user can efficiently receive a printing service without a troublesome operation. A request including order information for placing a printing order regarding image data stored in a recorder is sent from a mobile phone to a mobile phone site server together with an identification code of the mobile phone. The mobile phone site server issues an ID, and sends the ID, user information obtained from the identification code, and the order information to a service provision server. The service provision server registers the ID, the user information, and the order information. The ID is also sent to the mobile phone, and the mobile phone sends the ID to the recorder. The recorder sends the image data and the ID to the service provision server. The service provision server relates the image data and the order by using the ID, and prints the image data.