Abstract: A communication management control system manages exchange of data between an external information processing unit and an internal information processing unit via a router. The communication management control system includes a first local area network (LAN) coupled to the internal information processing unit, a second local area network (LAN) coupled to the router, and a communication control unit coupled to the first LAN and the second LAN.

Abstract: In a transaction support method and a transaction support apparatus for simply executing inquiries for a plurality of raw materials used to produce a finished product therefrom, when a predetermined finished product composed of a plurality of raw materials is designated by a client of a buyer, a finished product designating unit receives the designated finished product. A raw material referring unit obtains information as to raw materials constituting the designated finished product. A raw material classifying unit classifies the raw materials to respective sellers concerned. An inquiry unit makes inquiries to clients of buyers concerned based on a result of the classification executed by the raw material classifying unit. An auction unit determines conditions through an auction when a plurality of sellers are available for the same raw material.