PROBLEM TO BE SOLVED : the improvement of a transaction fee expensive. Earthquake or high insulating performance is concerned, such as for inspection of the presentation of information (inspection), guarantee, building or home manufacturer defect liability to industry. Inspection of the transaction information unified proficiency or efforts, such as home plumbing contractor responsible for explanation of guaranteeing, reducing anxiety of the purchaser. The increase of the amount of real estate sales transaction. Although the country consumer or IT and participates in the reduction of a transaction fee, plainly secure transaction. SOLUTION : about 1% of the price of the consumer cashe back to the mechanism by reducing the load, to increase the amount of real estate sales transaction. Details of the building to house a country, application of the estate sales person desiring a charge when a request for a constant inspection (inspection) such as the presentation of the estate of marriageable obtd. wrestler, coordinating the transaction security. Selected drawing : no