A mobile terminal including a sensor unit configured to sense an orientation direction of a housing of the mobile terminal, a first display unit configured to display a first screen image, an interface unit configured to be connected to an external display device having a second display unit, and a controller configured to interface with the external display device to display a monitor window including a second screen image corresponding to the first screen image on the external display device, and to control the monitor window to be displayed on the second display unit according to the sensed orientation direction of the housing.