This invention makes it possible to reduce excess inventory, reduce costs due to unnecessary shipping costs, and to improve reliability.The invention comprises: a server 10 and brand manufacturer's terminal 20 that belong to a brand manufacturer which is the order-receiving party; a dealer's terminal 30 that belongs to the dealer which is the ordering party and that is connected to the server 10 via a communications line 50 such that they can communicate with each other; and a parts manufacturer's terminal 40 that belongs to the parts manufacturer and that is connected to the server 10 via a communications line 50 such that they can communicate with each other; and where the server 10 has a function of managing information about processing and process delays from the time when the order for parts is received from the dealer's terminal 30 until the scheduled delivery of the parts, and has a function of providing that information when there is access from the dealer's terminal 30.