Provided are a portable device and a screen display method of a portable device. The portable device includes an edge touch screen that has a main display area, has a left edge display area and a right edge display area which are individually extended from the main display area, and configured to display an application screen thereon; and a controller configured to control the edge touch screen, a first application screen corresponding to a first user input to be displayed on the edge touch screen, a second application screen corresponding to a second user input to be displayed in the main display area, and a part of the first application screen to be displayed in the left edge display area or the right edge display area.