an apparatus capable of taking a self - portrait picture includes a screen , a camera , and a controller configured to cause the screen to display a live preview image received from the camera , after the live preview image is displayed , detect a first user gesture for triggering a display of an indicator on the screen , cause the screen to display the indicator at a changeable position where the first user gesture is detected , wherein the indicator indicates that a gesture detection mode is entered to recognize a second user gesture different from the first user gesture , while the indicator is displayed on the screen , detect the second user gesture in the indicator , and after detecting the second user gesture , cause the camera to automatically take a self - portrait picture .