Abstract: A method for procuring parts includes the steps of determining a planned production quantity of a product to be produced during a predetermined time period; preparing an order form, the order form comprising an order quantity obtained by calculating, according to the planned production quantity, a required parts quantity required during the predetermined time period and calculating, according to the required parts quantity, a parts quantity to be delivered during the predetermined time period, and sending it to a supplier; determining an actual production quantity of the product to be produced during a predetermined time period taking a current production progress status into consideration; and issuing a delivery instruction form comprising a delivery quantity being a parts quantity to be delivered during the predetermined time period, the parts quantity calculated according to the actual production quantity, and sending the delivery instruction form to the supplier.