<p>A portable computer is provided to display an image selectively according to a plurality of display units, use the plurality of display units easily through a simple structure to improve user accessibility and reduce energy consumption. A portable computer(1) includes a main unit and a plurality of display units(300). The main unit reads and processes data to generate an image signal. The display units are attached to the main unit in such a manner that display sides thereof are stacked and receive the image signal to display an image selectively corresponding to the image signal when separated from the main unit.</p>
