The present invention related to the auction system for real estate, if it is desired, a seller of real estate, real estate to, a means for registering the use of support service and, when a user desires the auction of the tender, to the Bidder, registered by a real estate agent, sales contract related to the use of support service procedure and means to register, a seller of real estate on the auction bidder in response to the determined, desired or seller to support service bidder is registered and a determining means for determining whether a, or seller bidder is registered by the utilization of support service when desired, a real estate agent and a notification means. Furthermore, support the contents of service, or contract witnessing bid a property of right investigation, loan procedure procuration, registration, reforming, .