Disclosed is a system for displaying a user interface for a telecommunication terminal. A control unit determines the current rotation state of a display unit through a rotation sensing unit. When the rotation state of the display unit varies, UI information is loaded according to the currently-determined rotation state of the display unit. The UI screen is reconstructed according to the loaded UI information and is then rotated according to the rotation state of the display unit and displayed on the display unit. If information on a dedicated UI screen which has been preset according to a currently-running application is found during the step of loading the UI information, then the information on the dedicated UI screen is loaded. The UI screen is reconstructed according to the loaded information on the dedicated UI screen and is displayed.