PROBLEM TO BE SOLVED : accurately evaluating the real estate prices, predicting a future real estate prices. Also, future economic conditions in accordance with various conditions including the estimation and estimate the cost of distribution. SOLUTION : from the periphery of the estate market and evaluated by estimating a monthly, per unit area, the rent, station walking distance, by considering the ages, calculating the fair price, expected yields is estimated. Furthermore, the transition of future property price, in future estimated number of households, consumer price index, disposable income, substantial interest, monetary base, rent of future change predicting, based on an estimated value of a diffusion index or the like, is estimated by the Monte Carlo simulation method or the like, thereby estimating a profitable investment, further adapted to estimate the total investment. Selected drawing : fig. 1