Disclosed is a mobile terminal, by which an image can be easily attached. In particular, the present invention includes a 1st camera, a touchscreen, and a controller controlling the touchscreen to output a running screen of a prescribed application and a preview screen of the 1st camera to a 1st region and a 2nd region on the touchscreen, respectively, the controller, if a photograph command is received, attaching an image data photographed through the 1st camera to the prescribed application, wherein a data size of the attached image data is based on a size of the 2nd region.