PROBLEM TO BE SOLVED : To simultaneously resolve how to evoke the demand for used condominiums stagnant on the market and how to provide asset management of less risks, which is possible even with a small amount of investment, under the present financial situation.SOLUTION : One investor is not allowed to invest a large amount of capital in real estates but small investors capable of investing hundreds of thousands yen as a unit are collected from general investors and are allowed to purchase one property together, so that the investment capital burden is reduced to allow more investors to easily participate in investment opportunities. A realtor selects a good property as a real estate investment and calculates a rate of yield by utilizing a prescribed format and collects small investors. Small investors have their ownerships registered as shared equities in order to secure investment principal. The realtor has the duty to perform the operation from tenant collection to efficient collection of rent incomes and bears and deals with troublesomeness peculiar to real estates.