PURPOSE : An auction processing system and method using a priority bid tender is provided to increase a possibility of a trade contract by making an auction participator grant a series of purchase priority with respect to a plurality of real estates for sale and suggest a bidding price with respect to each real estate properly.CONSTITUTION : A member information DB(60a) stores information related to a member or a client registered in an auction processing system(100). A selling article information DB(60b) stores information registered by each sale desirer and information with respect to the minimum bidding price, a bid tender unit, an auction valid term, a price adjustment term, and a price adjustment range. A bid tender price/order information DB(60c) stores a bid tender price suggested by a plurality of sale desirers and information related to a purchase priority. A transaction result information DB(60d) stores transaction contract information with respect to each article for sale. A bid tender price comparison unit(20) compares bid tender prices suggested to each selling article therewith interactively, suggests a higher bid tender price to the upper price deciding unit(30), and suggests a lower bid tender price to the lower price deciding unit(40). A priority order adjusting unit(50) adjusts a priority order granted by a purchase desirer who suggested the lower price to each article for sale. An auction and price control unit(10) monitors information an auction valid term, a price adjustment term, a price adjustment range set to an article for sale by each sale desirer continuously. If a price adjustment term is passed, the lowest bidding price is adjusted at a lower price and information of an article for sale is updated in the DB(60b).? KIPO 2003