PROBLEM TO BE SOLVED : To prevent the use of a real estate name, etc. used by the other person without permission, thereby contributing to the prevention of a dispute, and to provide useful information in regard to real estate, thereby contributing to advertisement and transaction.SOLUTION : Original information such as a name, design and an advertising copy related to real estate to obtain differentiation from the other company is registered together with a time stamp representing the reception time thereof. The registered original information is searched for use in advertisement, publicity and transaction. Also, as to the registered original information, a registration certificate is issued based on the time stamp depending on a request. Further, evaluation information for evaluating the original information such as an access count is registered into a database together with the original information.COPYRIGHT : (C)2006, JPO&NCIPI