Abstract: Each tool, each chuck jaw, and each hand are provided with a characteristic data storing element. Characteristic data concerning tools, chuck jaws and hands are stored in each characteristic data element. The characteristic data concerning each tool, each chuck jaw and each hand are read out of the characteristic data storing element. Tools to be installed on a tool rest and chuck jaws to be installed on a spindle chuck are discriminated according to kinds of machinings. A predetermined hand is selected from a stocker on the basis of the read out characteristic data so as to install on a carrier robot. A workpiece is picked out of a pallet so as to carry to a spindle chuck by a carrier robot. A predetermined tool is selected from the stocker on the basis of the read out characteristic data so as to carry to the tool rest by a carrier robot. A predetermined chuck jaw is selected from the stocker on the basis of the read out characteristic data so as to carry to the spindle chuck by a carrier robot.