A mobile terminal and controlling method thereof are disclosed. One embodiment of the invention includes displaying at least one portion of a 3D user interface provided with at least two icons including a first icon and a second icon on a touchscreen, situating the first icon and the second icon to different 3D depths in the 3D user interface, respectively, and if a touch command is inputted to the touchscreen, enabling the icon of the first or second icon existing to a specific 3D depth corresponding to the touch command to respond to the touch command.