Bid-type auction method using variable contract price

PURPOSE: A bid-type auction method using a variable contract price is provided so that auction and lot drawing can be fairly performed by repaying bid guaranty money to members when auction conditions are not satisfied, and opening the whole auction process to the members when the auction conditions are satisfied. CONSTITUTION: A plurality of general users(30-33) access a web server(12) through an Internet network(29). The web server(12) provides a main page to all the users(30-33) regardless of membership. In addition, the web server(12) connects the main page to a database server(10), a bid server(11) and a related site server through the LAN and Internet, so that the general users(30-33) can freely move to a wanted page. The database server(10) provides a member registration/withdrawal frame to the general users(30-33), and manages a database of members including personal information, site using states and bid deposit accounts of the members and an administrator mode. On the other hand, the bid server(11) provides a bid-type auction frame using deposit money to the general users(30-33), and manages a program for the bid product registration, bid process, bid close and lot drawing.