A mobile terminal and controlling method thereof are disclosed, which facilitates a terminal to be used in further consideration of user's convenience. The present invention includes a first camera, a second camera, a touchscreen, and a controller, if the first and second cameras are activated, outputting a first preview screen for the first camera through the touchscreen, the controller outputting a second preview screen for the second camera to a prescribed region having a first shape in the outputted first preview screen, the controller changing the first shape into a second shape based on an image received through at least one of the first camera and the second camera. Accordingly, an image can be effectively photographed or a video call can be effectively performed, using front and rear cameras.