PROBLEM TO BE SOLVED : To allow a customer to acquire real estate information for transaction of a real estate property without registering personal information to be used for directly identifying an individual such as a name or an address.SOLUTION : When a server 1 is accessed from a cellphone 4 of a customer with an ID for identifying a real estate company, individual identification information of the cellphone 4 is acquired, and the ID for identifying the real estate company is registered in association with the individual identification information. When accessed from the cellphone 4 with the individual identification information, information about the real estate property associated with the real estate company identified by the ID associated with the individual identification information is provided.COPYRIGHT : (C)2011, JPO&INPIT