PROBLEM TO BE SOLVED : To solve a problem in a real estate deal that a real estate property owner of an individual and a corporation in a real estate property registration system which cannot supply a property advertisement, and a real estate property advertisement supply system cannot directly register the real estate property in a database, and direct large cost and much time, and a real estate agent or intermediate agent are required.SOLUTION : A real estate property registrant and real estate property advertisement supplier stores real estate property information in a database interfaced with a host computer through the Internet. A real estate property searcher and a real estate property advertisement recipient search a real estate property stored in the database through the Internet, transmits inquiry information to an e-mail address which is inputted when the real estate property registrant and the real estate property advertisement supplier of a search result registers as a member through a communication information input form previously stored in the host computer.COPYRIGHT : (C)2007, JPO&INPIT