PROBLEM TO BE SOLVED : listed real estate investment security (J-REIT) appropriate buying of information for determining a timing for generating investor. SOLUTION : to the base of a valuation J-REIT pure property value (NAV), the ratio of the investment cost of port (P) in the market (P/NAV magnification) from presenting an expectation, each P/NAV magnification of the number of times of occurrence of the present histogramming P/NAV times to display position, the maximum value and the minimum value of P/NAV times based on the ratio of the predetermined upper threshold and the lower threshold is reached automatically calculation/display/report, the present market price of a comparatively moderate degree of ?capable of easily identifying information. Furthermore, for a certain period of time, the rate of volume change of the summation P/NAV times the value obtained by multiplying the accumulated weight is, as a net accumulated ?momentum by bar graph display, acceleration or deceleration or acceleration/deceleration of the market of momentum of grasp the branch point, it is reversed, the market can be known. Selected drawing : fig. 1