A heavy equipment comprising a lower frame, an upper frame and a leveling means, the lower frame having traveling means, the upper frame tiltably and swingably connected to the lower frame, an image display system adapted to control automatic leveling of the heavy equipment, the image display system comprising: a sensor unit adapted to sense posture information of the heavy equipment; a leveler electronic control unit adapted to generate an image signal from the posture information; and an image display unit adapted to display the image signal on a display screen; wherein the posture information includes inclination angles of the upper frame and the lower frame sensed on the basis of a horizontal surface against a direction of gravity, and a swing angle of the upper frame sensed on the basis of a front direction of the lower frame; wherein the image display unit is adapted to display the heavy equipment as a symbol that symbolizes the heavy equipment; wherein the sensor unit comprises: a swing angle sensing means adapted to sense the swing angle of the upper frame; the heavy equipment being characterized in that the leveling means being adapted for adjusting horizontal levels of the upper frame; wherein the posture information further includes an azimuth angle of the heavy equipment sensed against a forward direction of the upper frame; the sensor unit comprises an inclination angle sensors, installed on one side of the upper frame and the lower frame respectively, adapted to sense pitching angles and rolling angles of the upper frame and the lower frame; an electronic compass, installed on one side of the upper frame, adapted to sense the azimuth angle of the heavy equipment against the forward direction of the upper frame; and the swing angle sensing means are installed in the center position of the leveling means; the image display system is adapted such that the inclination of the lower frame and the upper frame is displayed as an operation change of the symbol on the image display unit; wherein, on the symbol, a horizontal line against a direction of gravity is displayed as a reference line of the leveling means. a sensor unit adapted to sense posture information of the heavy equipment; a leveler electronic control unit adapted to generate an image signal from the posture information; and an image display unit adapted to display the image signal on a display screen; wherein the posture information includes inclination angles of the upper frame and the lower frame sensed on the basis of a horizontal surface against a direction of gravity, and a swing angle of the upper frame sensed on the basis of a front direction of the lower frame; wherein the image display unit is adapted to display the heavy equipment as a symbol that symbolizes the heavy equipment; wherein the sensor unit comprises: a swing angle sensing means adapted to sense the swing angle of the upper frame; the heavy equipment being characterized in that the leveling means being adapted for adjusting horizontal levels of the upper frame; wherein the posture information further includes an azimuth angle of the heavy equipment sensed against a forward direction of the upper frame; the sensor unit comprises an inclination angle sensors, installed on one side of the upper frame and the lower frame respectively, adapted to sense pitching angles and rolling angles of the upper frame and the lower frame; an electronic compass, installed on one side of the upper frame, adapted to sense the azimuth angle of the heavy equipment against the forward direction of the upper frame; and the swing angle sensing means are installed in the center position of the leveling means; the image display system is adapted such that the inclination of the lower frame and the upper frame is displayed as an operation change of the symbol on the image display unit; wherein, on the symbol, a horizontal line against a direction of gravity is displayed as a reference line of the leveling means. a swing angle sensing means adapted to sense the swing angle of the upper frame; the heavy equipment being characterized in that the leveling means being adapted for adjusting horizontal levels of the upper frame; wherein the posture information further includes an azimuth angle of the heavy equipment sensed against a forward direction of the upper frame; the sensor unit comprises an inclination angle sensors, installed on one side of the upper frame and the lower frame respectively, adapted to sense pitching angles and rolling angles of the upper frame and the lower frame; an electronic compass, installed on one side of the upper frame, adapted to sense the azimuth angle of the heavy equipment against the forward direction of the upper frame; and the swing angle sensing means are installed in the center position of the leveling means; the image display system is adapted such that the inclination of the lower frame and the upper frame is displayed as an operation change of the symbol on the image display unit; wherein, on the symbol, a horizontal line against a direction of gravity is displayed as a reference line of the leveling means.