| 摘要 |
A web server in a center device collects transaction conditions of materials via the Internet from a material-seller terminal which each of material sellers has, and the collected transaction conditions are assessed. Thereby, the best material-seller is selected, and sales conditions of the best material-seller selected are offered, via the Internet, to a material-buyer terminal which each of material buyers has. The material buyers buy desired materials via the Internet based on the sales conditions offered via the Internet.
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