Abstract: A parts classification unit 15 displays parts 70 and a palletizing robot 20 so as to compute the absorbing position of the palletizing robot 20 with respect to the parts 70 displayed as part.robot information BRJ by the instruction of an operator. The moving.positioning instruction FRn of the robot 20 between the classification head 5 and the pallet 10 is composed on the basis of the parts.robot information BRJ, sheet nesting information SNJ showing location state of the parts in the classification head and pallet nesting information PNJ showing location state of the parts on the pallet 10. By this structure, the time of machining and classification is made shortened without teaching.