An image forming apparatus which includes a plurality of operating modes, the apparatus including a main body, a scanning unit to move along the main body and obtains an image data from an object to be scanned, an operation state display unit to display a position of the scanning unit, and a controller to set a display mode corresponding to an operating state that includes at least one operating mode of the plurality of operating modes and controls the operation state display unit to display the display mode set corresponding to the operating state.