When order information is recorded in a recording medium and an image output service is requested using this order information, the content of a new order is not confused with that of an old order and a user's intention can be conveyed accurately to a service provider in the case where orders are placed repeatedly by using the same recording medium. The user is caused to confirm all order information recorded in the recording medium by using an index relating images to the quantity of prints both displayed on a screen, for example. The user's intention is confirmed by an order confirmation operation carried out by the user, and the intention is provided to the service provider as confirmed order information recorded in the recording medium.