To group workpieces in accordance with sorting conditions for prescribed operation to be stacked on a pallet.

This system is applied to a drawing line in which workpieces carried from a processing facility are stacked onto the pallet to be supplied to a subsequent process. Workpiece stacking style information to group and allot the workpieces onto the pallet is generated in accordance with the sorting conditions for prescribed operation based on work instructions. After the workpieces are processed in accordance with the work instructions, the workpieces are stacked on the pallet based on the workpiece stacking style information.