In usual, planners can't acquire enough information on the socio-economic system to be analyzed. In this case, the acquisition of additional information is requested. To evaluate whether new statistical information is valuable compared to the costs of survey, we develope new method. Our method makes it possible to derive numerically the probability distribution of micorstate of the socio-economic system which is consistent with the observed statistical information and equilibrium condition. Through simple numerical simulation, we show the applicability of developped method.