PROBLEM TO BE SOLVED : To enable a general person to know a real estate market price as if the price is an assessed price of an actual specific real estate, regardless of the presence or absence of the real estate actually appearing in a deal market.SOLUTION : A virtual real estate model is assumed in each area. The assessed price of each the virtual real estate model obtained by applying various elements used for price assessment of a substantial real estate is registered at a market price database 11 of a site 10. By viewing contents of the market price database 11 for public inspection, the assessed price of the real estate property not appearing in the deal market is introduced.