1. A mobile terminal comprising: a wireless communication unit configured to wirelessly communicate with at least one other terminal; a touch screen configured to: display, on the touch screen in an activated state in which illumination is applied to the touch screen, one of a home screen including at least one icon linked to a preset function, an application execution screen in full screen of an application corresponding to the linked preset function, and a lock screen displaying an input area for entering an input for unlocking the mobile terminal, receive a tapping gesture including first and second taps consecutively applied to the touch screen in the activated state, in response to receiving the tapping gesture on an empty space of the home screen on which the icon is not displayed while in the active state in which illumination is applied to the touch screen, deactivate illumination of the touch screen by switching the touch screen from the activated state to an inactive state in which illumination is not applied to the touch screen, in response to receiving the tapping gesture on an empty space of the lock screen on which the input area is not displayed while in the active state in which illumination is applied to the touch screen, deactivate illumination of the touch screen by switching the touch screen from the activated state to an inactive state in which illumination is not applied to the touch screen, and in response to receiving the tapping gesture on the application execution screen, activate a predetermined function associated with the application and not switch the touch screen from the activated state to the inactivated state, wherein when the touch screen is switched from the activated state to the inactivated state, the touch screen is automatically switched to the inactivated state without further input.