A method of controlling a portable device including a flip cover for covering a display unit according to one embodiment of the present specification includes the steps of detecting that the portable device operates in a standby mode and the flip cover is positioned in a closed position, wherein the flip cover contains an open window and wherein the open window exposes a first part of the display unit when the flip cover is positioned in a closed position, sensing an orientation of the portable device, detecting a first control input, when the orientation of the portable device corresponds to a first orientation, displaying predetermined information in the first part of the display unit and when the orientation of the portable device corresponds to a second orientation, activating the camera unit in response to the first control input and displaying a first preview image of the digital image sensed by the camera unit in the first part of the display unit.