PROBLEM TO BE SOLVED : To provide a real estate deal system of very low dealing cost by using a communication network.SOLUTION : By using the communication network, a user desiring to purchase or rent a real estate can search and browse for things when necessary, and the user desiring to purchase or rent a real estate and a user desiring to sell or rent a real estate can examine the real estate itself by the two parties without presence of the third party such as an intermediary agent and an estate escrow service dealer. Labor of the third party can be largely reduced, and a real estate deal can be conducted at a very low cost. A program for trial calculation of loan is provided to make it possible to make a fund plan taking newest financial situations into consideration, so that the estate is to be purchased or not can be speedily, correctly, and easily determined by a purchaser. When the estate deal is concluded, showing of the estate can be easily and immediately deleted. This system is thus favorable as a real estate distribution means. Since application for loan after conclusion of a sales contract can also be conducted, settlement for a financial institution can be simply, speedily, and correctly conducted.