PROBLEM TO BE SOLVED : To provide a real estate intermediating method by a system consisting of a real estate auction supporting server. SOLUTION : In the real estate auction supporting server uploading auction real estate information to the real estate auction list of the web site in response to the auction real estate information registering request of many client terminal device on a network and supporting information and an auction elated with real estate by the connection request of the client terminal device and an information retrieving or auction participating request, the information related with auction real estate is registered from a client and the manager of a real estate transaction office to be constructed in database, a specific real estate auction date and information are uploaded to the web site to guide participation to the auction, and a bidding value inputted from the client terminal device and a terminal device at the real estate transaction office during an auction time fixed to be the real estate auction date are compared and judged to upload a final successively bidding value.