PROBLEM TO BE SOLVED : To provide a sales promotion system capable of expanding a customer class for a dwelling real estate such as an apartment house reduced because of decrease in the birthrate, and for selling a sales inventory such as the apartment house stocked in a real estate supplier, and a property or the like with an unsunny aspect of high sales risk in the same apartment house block.SOLUTION : The real estate property such as the apartment house is stored into a database, and a point, a giveaway or the like is restored to a purchaser, so as to promote the sale of the real estate property.COPYRIGHT : (C)2006, JPO&NCIPI