PROBLEM TO BE SOLVED : To provide a real estate auction system capable of improving transaction concluding performance. ?SOLUTION : Whether or not property is selected is determined, and when it is selected (S71; Y), detailed information and a bid format are read and transmitted to a bid terminal (S72). A server device receives a bid answer (S73), and determined whether or not a bid sum is included in the bid answer. When the bid sum is included (S74; Y), the bid sum is registered (S75), and when the bid sum information is not included (S74; N), a bid avoidance reason is registered (S76). Whether or not a bid period is expired is determined, and when it is expired (S77; Y), the maximum bid sum information is extracted (S78), and whether or not the maximum bid sum is a value not less than a desired minimum selling price is determined (S79). When the maximum bid sum is not less than the desired minimum selling price (S79; Y), bid processing is executed (S80), and the calculation processing of data associated with property is carried out (S81). ?COPYRIGHT : (C)2004, JPO&NCIPI ?