A shopping register creating part (111) creates shopping information including a purchase planned quantity of materials by each term based on an inventory standard master (110) in which inventory standard information at least including a lower limit amount of the material in the inventory is set and a maintenance calendar including a planned date of a maintenance work. A material order management part (112) accepts an order of a desired material from the shopping information in accordance with an operation of a user, then inputs a purchase result of the desired material. An inventory management purchase actual performance management part (113) updates an inventory management table managing a material quantity in the inventory based on the purchase result. An equipment master updating part (101) updates the inventory standard master (110) based on an updated result of the inventory management table.