A control apparatus for a device with one of the left side and the right side of the device fixed as pressed against the palm of a user. The device includes a button that can be depressed within a predetermined movable range and a sense-of-force presentation block for presenting a sensor of force against button depression within a range in which any of the fingers of the user is reachable, the input of a sense-of-force presentation start position in the predetermined movable range being received, a button depressing amount being acquired, and, when the sense-of-force presentation start position is reached, instructing the sense-of-force presentation block to present a sense force against the depressing of the button.