There are provided a mobile device and a method of controlling a screen of the mobile device. The mobile device includes: a display unit including an effective display area for displaying a screen; a touch screen panel including a plurality of sensing electrodes; and a control unit detecting a touch input based on a sensing signal generated from the plurality of sensing electrodes and controlling the screen displayed by the display unit, wherein when the touch input corresponds to a previously set first input gesture, the control unit controls such that a size of the screen is reduced at a predetermined first ratio and the reduced screen is only displayed in a portion of the effective display area.