Abstract: The numerical controller is equipped with a setting display unit which comprises:a display unit consisting of an echo data display area, a data display area, and a numerically-controlled operation status display area;a total functional key group for selecting pictures that respond to desired functions;a switching key for changing the background color of echo data displayed on the echo data display area in the display unit; andan echo key group for setting or resetting effective echo data that are displayed on the echo data display area.