To simply configure an auction system in the auction system for holding auction by wirelessly connecting the terminals of purchasers and the terminal of an auctioneer.

The terminals of purchasers and the terminal of the auctioneer are wirelessly connected by a single carrier wave, a means for superimposing a peculiar identification code imparted to each of terminal of purchasers on a transmitting signal is provided and the terminal of the auctioneer is provided with a means for detecting radio power and a means for detecting received power. In this auction system, when the received power equal to or higher than a fixed value is detected, the wireless terminal of the auctioneer judges the presence of a purchaser to respond to bidding and when a plurality of identification codes are detected within a fixed period from the detection of power, auction is held again after increasing a bidding price. When only one identification code is detected within a fixed period from the detection of power, the auction is established.