A mobile terminal includes: a camera; a touch screen; and a controller configured to: cause the touch screen to display an image received via the camera, the image acquired at a first magnification ratio; control the camera to change a magnification ratio from the first magnification ratio to a second magnification ratio based on a touch applied to the touch screen displaying the image; cause the touch screen to display an image acquired at the second magnification ratio; and activate a specific function if the touch is continuously applied to the touch screen displaying the image acquired at the second magnification ratio.