To prevent an artificial miss by setting a package constitution number and managing order reception data input to shipment indication in commodity package units on the basis of a package constitution master having file structure.

The package constitution master has information on the names of commodities to be package, their quantities, and the kinds and quantities of packaging materials, and is stored in record format using package constitution numbers as keys. For order reception from a client, commodities are referred to with package constitution numbers that a client master 3 and the package constitution master have to select an order-received client and commodities in package units, and quantities and order reception and shipment dates are inputted through a terminal device 1 to generate an order reception detail file managed with package constitution numbers. Consequently, constituent information management from order reception to shipment can be done on a computer for a package-kind specified order from a client by handling a package unit of commodities as if it were one article.