Image displaying apparatus and image signal processing method of the same

PURPOSE: A display device and image signal processing method thereof are provided to display a three-dimensional image signal as a two-dimensional image to which frame rate is compensated. CONSTITUTION: A signal receiving unit receives an image signal. A signal separating unit separates a left eye signal and a right eye signal. An FRC unit controls the frame rate of the received video signal. A user selecting unit selects a display method of the received image signal. A display unit displays an image by the user selection unit based on the image signal. A control unit controls the FRC unit and the signal separating unit.