PROBLEM TO BE SOLVED : To effectively utilize retrieval by making not only the basic condition of a real estate property but also detailed information such as an external element to be an object for storage, retrieval and display.SOLUTION : Real estate information stored in a database 2 becomes a providing object in designation as a retrieval condition and in a list, etc., and the real estate information in this performance form includes not only the basic condition but also the detailed information, such as environment information representing a living environment in addition to a characteristic information, an external appearance image or the other property images, equipment information representing equipment, view information representing what view is seen, residence rule information representing a residence rule and sales state information representing a sales situation.