A mobile terminal and controlling method thereof are disclosed, by which fluctuation of a screen can be reduced. The present invention includes a lens, a lens drive unit configured to move the lens along an x-axis and y-axis which are vertical to an optical axis and a z-axis parallel to the optical axis or to rotate the lens centering on the x-axis and the y-axis, an image pickup unit configured to generate a digital signal by detecting a light having passed through the lens, an image processor configured to create a preview image by applying an image processing to the digital signal, a display unit configured to display the preview image, and a controller, if a distance between the lens and the image pickup unit is shorter than a preset distance, controlling a partial region of the preview image to be outputted through the display unit.