To enable a person to set a set figure to a desired value, at the time of changing the set figure by a predetermined unit during continuation of operation of an operation part, without continuously gazing the ever-changing display of the set figure, and speedily perform the setting.

As another index showing the present state of the set figure in addition to the display of the set figure, one or more of the magnitude of the value of the set figure or its change value, arrival of the value of the set figure or the change value at a predetermined value, and change of the unit of changing the set figure are reported through tactile sense by a vibration generation part 12 vibrating the operation part 11, through visual sense by a voice output part 13, or through visual sense by changing the display pattern of the figure display. For a predetermined time after starting the operation of the operation part 11, the set figure is continuously changed by changing by a minimum unit, and thereafter discontinuously changed by entirely or partially changing by a plurality of minimum units.