A graphical user interface system, comprising - a processing device configured to provide a graphical user interface to a display device for displaying the graphical user interface on the display device, - a tracking device coupled to the processing device and configured to track at least a part of a user's head and to provide tracking data indicative of a user's line of vision, - a gesture recognition device coupled to the processing device and configured to detect a user's gesture (23A, 23B) and to provide user gesture data in accordance with a detected user's gesture, - wherein the processing device is configured to segment the graphical user interface into a plurality of segments, and to determine at least one of the segments as an active input segment responsive for user input in accordance with the tracking data indicative of the user's line of vision, and to determine the other ones of the segments as non-active input segments which are non-responsive for user input, - wherein the gesture recognition device is configured to detect a user's gesture (23A, 23B) within a first range which corresponds to a range of the active input segment, wherein the first range is set in accordance with the range of the active input segment or the range of the active input segment is adjusted to the first range, and - the processing device is configured to provide the graphical user interface on the display device within a second range, wherein the first range is smaller than the second range, - wherein the processing device is configured to associate at least one element of the graphical user interface within the active input segment with the detected user's gesture (23A, 23B) for user input and to initiate at least one input function based on the user gesture data. - a processing device configured to provide a graphical user interface to a display device for displaying the graphical user interface on the display device, - a tracking device coupled to the processing device and configured to track at least a part of a user's head and to provide tracking data indicative of a user's line of vision, - a gesture recognition device coupled to the processing device and configured to detect a user's gesture (23A, 23B) and to provide user gesture data in accordance with a detected user's gesture, - wherein the processing device is configured to segment the graphical user interface into a plurality of segments, and to determine at least one of the segments as an active input segment responsive for user input in accordance with the tracking data indicative of the user's line of vision, and to determine the other ones of the segments as non-active input segments which are non-responsive for user input, - wherein the gesture recognition device is configured to detect a user's gesture (23A, 23B) within a first range which corresponds to a range of the active input segment, wherein the first range is set in accordance with the range of the active input segment or the range of the active input segment is adjusted to the first range, and - the processing device is configured to provide the graphical user interface on the display device within a second range, wherein the first range is smaller than the second range, - wherein the processing device is configured to associate at least one element of the graphical user interface within the active input segment with the detected user's gesture (23A, 23B) for user input and to initiate at least one input function based on the user gesture data.