A control device controls display of a display device for displaying a display screen for setting operations of the control device that controls an industrial machine and soft keys for operating the display screen. The control device includes: a key input processing unit that receives input from an input device; an input content determining unit that determines a content of the input received by the key input processing unit; a storage unit that stores a soft key definition information table in which operation contents on the display screen to be allocated to the soft keys are defined in advance; a soft key allocation selecting unit that selects the operation contents to be allocated to the soft keys; and a soft key display processing unit that displays the soft keys allocated with the operation contents selected by the soft key allocation selecting unit on the display device.