“…On the other hand, Kaito et al 5) proposed a method of determining the optimal repair policy using the average cost method for transposing the life cycle cost to be generated in the future to an annual average cost, and evaluating it assuming that a life cycle cost evaluation using a discount rate cannot evaluate the effect of the formation of a long-life 2) . Furthermore, Aoki et al proposed a BMS that was built based on the optimal repair policy model utilizing the average cost method 7) . The BMS proposed by Aoki et al has an administrativeaccounting system aiming at the bridge valuation of assets for evaluating the performance of the maintenance repair record of the whole bridge system based on the maintenance repair record in each fiscal year and the budget control, when regarding control of maintenance of the complete bridge system.…”