A bidirectional slide-type mobile communication terminal for providing a user interface that changes in real time according to input includes a sensor-equipped lower body and an upper body that slides with respect to the lower body. A method of providing such a graphic user interface includes sensing a sliding movement of the upper body, switching the terminal to an operation mode corresponding to the direction of the sliding movement, displaying the graphic user interface corresponding to the operation mode to which the terminal is switched, receiving input from a sensor, and changing the displayed graphic user interface in real time corresponding to the received input.