1. A menu selection method for a mobile terminal, the method comprising: selecting a first main icon of at least two main icons displayed on a touch device upon receipt of a first touch directly to the first main icon, and displaying a first sub-icon corresponding to the selected first main icon at a left side of and separated from the first main icon such that a space exists between the first main icon and the first sub-icon, said first main icon corresponding to a sound icon indicating whether or not a sound is output by the mobile terminal and said first sub-icon corresponding to turning off the output of sound by the mobile terminal; sensing a dragging operation along a vector from the selected first main icon toward an intersection with the first sub-icon on the touch device without touching the first sub-icon; turning off the output of the sound by the mobile terminal after sensing the dragging operation and before the first sub-icon is touched; and selecting a second main icon of the at least two main icons displayed on the touch device upon receipt of a second touch directly to the second main icon, deactivating the first main icon, and displaying a second sub-icon corresponding to the selected second main icon.