A mobile terminal including a controller configured to execute an operation mode relating to one or more functions of the mobile terminal; a sensor configured to detect a motion of a pen unit by sensing ultrasonic waves generated by the pen unit; a display configured to display information; and a wireless communication unit configured to wireless communicate with at least one other mobile terminal. Further, the controller is further configured to compare the motion of the pen unit with a preset specific pattern, and to execute an operation corresponding to the specific pattern based on a result of the comparison.