PROBLEM TO BE SOLVED: To calculate a maintenance cost and present it to a user in consideration of a case where a device state prediction or a remaining life estimation result deviates. SOLUTION: The state value and remaining life of the plant equipment calculated based on the equipment state prediction model which is the state prediction model of the plant equipment and the past sensor data 102 of the plant equipment, and the quality of the state of the plant equipment. Based on the judgment result and the inspection record 101 of the plant equipment, the conformity rate, which is the ratio of the equipment predicted to be in bad condition, was actually the defective equipment, and the ratio of the equipment predicted to be in bad condition to the defective equipment. Includes the precision / recall calculation unit that calculates the recall rate, the precision rate, the recall rate, at least the preventive inspection unit price of plant equipment, the damage amount at the time of failure, the recovery unit price at the time of failure, and the spare part unit price. It is provided with a total maintenance cost calculation unit that calculates the estimated maintenance cost of the plant equipment, which is the minimum cost, based on the maintenance cost calculation information, and calculates it as the total maintenance cost required for the maintenance of the plant equipment. [Selection diagram] Fig. 1
展开▼
