A detachable dual mobile terminal including a first mobile terminal having a first display unit; a second mobile terminal having a second display unit; a coupling portion provided to couple or detach the first and second mobile terminals; a coupling sensor configured to sense whether the first and second mobile terminals are coupled or detached; and a controller included in each of the first and second mobile terminals and configured to unlock at least one of the first and second mobile terminals when an unlocking a code is input and when the coupling sensor senses the first and second mobile terminals are coupled to each other.