When both first and second preferred nozzles are set up as valid, and both nozzles are stored in a nozzle stocker, the replacement with the recommended nozzle stored in the stocker is made and a CPU controls the operation based on control data. When both are set up as valid, but only the second preferred nozzle, not the first preferred nozzle, is stored in the stocker, the CPU 20 recognizes which nozzle is available by using nozzle positioning data stored in a RAM, and then the replacement with an alternative nozzle is made, and the CPU controls the operation according to the control data of the alternative nozzle.