The present invention refers to real estate unit reaches potential upon which the an owner may purchase customer decision, can be carried out quickly since trading contract are, operator' s Internet site, portal Internet site, interactive TV data broadcasting (T-Commerce) so that notification to latent customer through, having a purchase intention plurality of reservation by high can be unit reaches real estate price, bid embodiment bidding mediation a remote car dealer customer purchase ensuring and spherical of article and the with stability and layer, a part of the, unit reaches real estate upon which the an owner may bidding method of intermediating real estate unit reaches to at proper price in by the, disclosure the customer number estate transaction market is to purchase a cigar since higher price can be hence reduces the risk of number, escrow using the real estate transaction in the device and so reduce the risk of performance trading fraud can be seller of the real estate of, dealer, and is beneficial to the acquirers estate transparent dealing in real estate which is supplied to the first.