An administrative server stores replacement component information relating to at least one replacement component that can be distributed by a supplier in delivery service. A replacement component desired by the user is selected. A selected replacement component information relating to the at least one selected replacement component is transmitted to the administrative server. When the usage degree of at least one of the at least one selected replacement component indicated by the usage degree information reaches a predetermined usage degree, the ordering request specifying the at least one replacement component included in the selected replacement component information is transmitted to the supplier. Therefore, the supplier can offer the automatic sales service with a replacement component that the supplier distributes normally without preparing a wide variety of replacement components, which reduces burden on the supplier.