A head mounted display device can include a display unit configured to output an image; a sensing unit configured to sense a first gesture input based on an image acquired through a camera; and a controller configured to recognize an external terminal corresponding to the first gesture input, execute a first function associated with the first gesture input while the first gesture input is sensed, sense, via the sensing unit, a second gesture input while the first function is being executed, maintain the execution of the first function while the first gesture input and second gesture input are no longer sensed, sense, via the sensing unit, a third gesture input, and in response to sensing the third gesture input, execute a second function together with the first function while the third gesture is sensed.