PURPOSE: A reverse auction method applied to an online marketing method using a marketing condition inputted from a member is provided to enable a user to perform transaction through reverse auction as well as simple transaction by applying the reverse auction method, as the marketing is performed in a way desired from the user through the online. CONSTITUTION: An auction condition for services or goods is inputted from a user terminal(22) and is stored in a main server(24). The auction condition is provided to member terminals. An auction condition accepting intention is received from the member terminal. The auction condition accepting intention is provided to the user terminal. The intention for selecting which one from the member terminals providing the auction condition accepting intention is received from the user terminal. A message informing the selection is sent to the selected member terminal.
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