A mobile apparatus, comprising: a display unit, including a screen, the display unit configured to display a 3D image comprising a plurality of layers (10-1, 10-2, 10-3) having different degrees of depth from each other and arranged in a depth direction that is perpendicular to the screen, each of the plurality of layers (10-1, 10-2, 10-3) including at least one content icon; a sensing unit which is configured to sense a movement of the mobile apparatus in the depth direction perpendicular to the screen; and a control unit which is configured to: activate a first layer among the plurality of layers (10-1, 10-2, 10-3), change the activated layer to another layer according to a direction and distance of the sensed movement when the movement of the mobile apparatus in the depth direction perpendicular to the screen is sensed and control the display unit to display the activated another layer, wherein if the distance of the sensed movement in the depth direction perpendicular to the screen exceeds a predetermined distance, the another layer is a layer different from a next lower or next higher layer and is activated immediately; wherein the display unit is further configured to display an indicator which includes a plurality of images (13-1, 13-2, 13-3) corresponding to the number of the plurality of layers (10-1, 10-2, 10-3) and to indicate the currently activated layer using the plurality of images (13-1, 13-2, 13-3). a display unit, including a screen, the display unit configured to display a 3D image comprising a plurality of layers (10-1, 10-2, 10-3) having different degrees of depth from each other and arranged in a depth direction that is perpendicular to the screen, each of the plurality of layers (10-1, 10-2, 10-3) including at least one content icon; a sensing unit which is configured to sense a movement of the mobile apparatus in the depth direction perpendicular to the screen; and a control unit which is configured to: activate a first layer among the plurality of layers (10-1, 10-2, 10-3), change the activated layer to another layer according to a direction and distance of the sensed movement when the movement of the mobile apparatus in the depth direction perpendicular to the screen is sensed and control the display unit to display the activated another layer, wherein if the distance of the sensed movement in the depth direction perpendicular to the screen exceeds a predetermined distance, the another layer is a layer different from a next lower or next higher layer and is activated immediately; wherein the display unit is further configured to display an indicator which includes a plurality of images (13-1, 13-2, 13-3) corresponding to the number of the plurality of layers (10-1, 10-2, 10-3) and to indicate the currently activated layer using the plurality of images (13-1, 13-2, 13-3). activate a first layer among the plurality of layers (10-1, 10-2, 10-3), change the activated layer to another layer according to a direction and distance of the sensed movement when the movement of the mobile apparatus in the depth direction perpendicular to the screen is sensed and control the display unit to display the activated another layer, wherein if the distance of the sensed movement in the depth direction perpendicular to the screen exceeds a predetermined distance, the another layer is a layer different from a next lower or next higher layer and is activated immediately; wherein the display unit is further configured to display an indicator which includes a plurality of images (13-1, 13-2, 13-3) corresponding to the number of the plurality of layers (10-1, 10-2, 10-3) and to indicate the currently activated layer using the plurality of images (13-1, 13-2, 13-3).