To significantly improve efficiency in inventory management, shipping work and desk work such as slip processing accompanying product shipment in various kinds of semiconductor device products.

When order information received by a sales representative of a sales division is input, a sales division order/shipping system 6 transmits result data to a head office order/shipping system 9, and the head office order/shipping system 9 registers the order reception of a head office on the basis of a sales division SO and instructs shipping to a head office warehouse management system 10 according to the delivery date of a head office TO. By the shipping instruction, the head office warehouse management system 10 instructs shipping work and records a shipping result to the head office warehouse management system 10 after direct shipment. A head office inventory management system 8 subtracts inventory and records the sales of the head office TO on the basis of shipping result information. The sales division order/ shipping system 6 registers the order of the sales division based on the shipping result information. The sales division order / shipping system 6 automatically records delivery with respect to the sales division PO of a previous process.