Abstract: A method and apparatus for constructing a dynamic menu for a user interface are provided. An application-related map is prepared on the basis of all executable applications. All applications connected with a currently running application are searched for on the application-related map at the request of a user to construct and display the dynamic menu. Thereby, a user-oriented interface is realized.

Abstract: An apparatus and method for controlling a user interface using a jog dial and a navigation key are provided. The method includes navigating a main menu by a jog dial and navigating a submenu by a navigation key in a menu structure having at least one step; and navigating the main menu without separate key input when movement of the jog dial is sensed while navigating a submenu.

Abstract: In a user interface method, system and device in a multitasking environment, it is possible for a user to view all of a plurality of simultaneously executed applications by assigning different display areas to the plurality of applications. In the method, system and device, priorities of applications already being executed and of additional applications for which execution is requested are determined, and a display area size is determined and assigned to each application according to its priority. The system comprises a set-top box for performing the latter functions and a user terminal for transmitting a user request, while the device comprises a control unit for performing the latter functions.

Abstract: In a user interface method, system and device in a multitasking environment, all applications being executed are displayed. Movement between applications being displayed and selection of the applications can be performed in response to a request from a user, such that the user can easily use applications being executed currently. Currently selected applications do not block other applications, and the user is able to simultaneously view all applications. The sizes and positions of the display areas assigned to the applications are determined based on stored feature values of each respective application, the entire display screen area being partitioned based on the feature values. The system comprises a set-top box and a user terminal, or a controller and a storage unit.