A mobile terminal and controlling method thereof are disclosed. The present disclosure includes a touchscreen configured to display a window of an application and a controller, when the window is shifted into a specific region of the touchscreen, reducing and transforming the window into an icon and controlling the touchscreen to display the icon within the specific region. Accordingly, after a window of an application has been displayed on a screen, when the window is shifted into a specific region within the screen, the screen is displayed in a manner of being reduced and transformed into an icon.