A method of controlling a mobile terminal, the method comprising: displaying, via a touch screen included on the mobile terminal, predetermined data; receiving, via a controller included on the mobile terminal, a first touch signal generated based on a predetermined first touch input; generating, via the controller, a display change notifying icon (210, 301) to notify the generation of the first touch signal; displaying, via the touch screen, the display change notifying icon (210, 301); changing an input mode of the touch screen to a first mode, according to the first touch signal; modifying, via the controller, the displayed predetermined data based on a second touch signal generated by a second touch input on the touch screen in the first mode; and zooming out on the displayed predetermined data when a user touches and drags a touch-and-drag signal pointing to a direction away from the display change notifying icon (210, 301); continuously displaying the display change notifying icon (201, 301) on the touch screen once the display change notifying icon (210, 301) is generated; zooming in on the displayed predetermined data when a user touches and drags a touch-and-drag signal pointing to a direction toward the display change notifying icon (210, 301), characterized by further comprising the steps of: changing, via the controller, from the first mode to a second mode when the display change notifying icon (210, 301) is selected; and modifying, via the controller, the displayed predetermined data based on a third touch signal generated by a third touch input on the touch screen in the second mode, while the display change notifying icon (210, 301) is simultaneously displayed on the touch screen, wherein the third touch signal includes an inclination direction drag-and-drop signal and the step of modifying the displayed predetermined data in the second mode further comprises enlarging a predetermined area of the predetermined data, the predetermined area determined by the inclination direction drag-and-drop signal, and displaying the enlarged predetermined data on an entire screen of the touch screen. displaying, via a touch screen included on the mobile terminal, predetermined data; receiving, via a controller included on the mobile terminal, a first touch signal generated based on a predetermined first touch input; generating, via the controller, a display change notifying icon (210, 301) to notify the generation of the first touch signal; displaying, via the touch screen, the display change notifying icon (210, 301); changing an input mode of the touch screen to a first mode, according to the first touch signal; modifying, via the controller, the displayed predetermined data based on a second touch signal generated by a second touch input on the touch screen in the first mode; and zooming out on the displayed predetermined data when a user touches and drags a touch-and-drag signal pointing to a direction away from the display change notifying icon (210, 301); continuously displaying the display change notifying icon (201, 301) on the touch screen once the display change notifying icon (210, 301) is generated; zooming in on the displayed predetermined data when a user touches and drags a touch-and-drag signal pointing to a direction toward the display change notifying icon (210, 301), characterized by further comprising the steps of: changing, via the controller, from the first mode to a second mode when the display change notifying icon (210, 301) is selected; and modifying, via the controller, the displayed predetermined data based on a third touch signal generated by a third touch input on the touch screen in the second mode, while the display change notifying icon (210, 301) is simultaneously displayed on the touch screen, wherein the third touch signal includes an inclination direction drag-and-drop signal and the step of modifying the displayed predetermined data in the second mode further comprises enlarging a predetermined area of the predetermined data, the predetermined area determined by the inclination direction drag-and-drop signal, and displaying the enlarged predetermined data on an entire screen of the touch screen. changing, via the controller, from the first mode to a second mode when the display change notifying icon (210, 301) is selected; and modifying, via the controller, the displayed predetermined data based on a third touch signal generated by a third touch input on the touch screen in the second mode, while the display change notifying icon (210, 301) is simultaneously displayed on the touch screen, wherein the third touch signal includes an inclination direction drag-and-drop signal and the step of modifying the displayed predetermined data in the second mode further comprises enlarging a predetermined area of the predetermined data, the predetermined area determined by the inclination direction drag-and-drop signal, and displaying the enlarged predetermined data on an entire screen of the touch screen.