Graphical user interface for expandable menus

1. A graphical user interface for a mobile telephone devised for presentation of hierarchical information, comprising:

a first menu field carrying a list of menu items, at least one of the menu items indicating a submenu field which is expandable within the first menu field, wherein a graphical layer effect is applied to an expanded submenu field such that expanded submenu field is displayed as a different layer than the first menu field, wherein, for an expanded submenu field located between two menu items, the first menu field is displayed as being separated into two first menu fields revealing the submenu field as an underlying layer therebetween; and

a selection indicator comprising a contour formed around a selected menu item in the expanded submenu field and a graphical layer effect applied to the contour to display the selection indicator as a layer above the underlying layer of the submenu field.

2. The graphical user interface as recited in claim 1 , wherein the graphical layer effect comprises visualization of an edge between displayed layers.

3. The graphical user interface as recited in claim 1 , wherein the graphical layer effect comprises a shadow on the underlying layer from an overlying layer.

4. The graphical user interface as recited in claim 1 , wherein a displayed overlying layer is defined by a field enclosed by a contour having rounded corners.

5. The graphical user interface as recited in claim 1 , wherein a displayed overlying layer is defined by a field enclosed by a contour having corners with an inner angle of more than 90°.

6. The graphical user interface as recited in claim 1 , wherein the menu item for the expanded submenu field is displayed in the underlying layer of the submenu field.

7. The graphical user interface as recited in claim 1 , wherein the parameter headings in the first menu field are arranged in an order determined by frequency of use.

8. The graphical user interface as recited in claim 1 , further comprising an item triggering field which can be activated to trigger an action associated with a menu item selected by the selection indicator.

9. The graphical user interface as recited in claim 1 , wherein the first menu field comprises an outer border defining an area therein, and when the submenu field is expanded within the first menu field, the area of the outer boarder remains the same.

10. A graphical interface system for a mobile telephone comprising a display connected to a microprocessor unit, and a computer program including computer program code which, when executed by the microprocessor unit, triggers the microprocessor unit to present, on the display, a graphical user interface comprising: a first menu field carrying a list of menu items, at least one of the menu items indicating a submenu field which is expandable within the first menu field, wherein a graphical layer effect is applied to an expanded submenu field such that the expanded submenu field is displayed as a different layer than the first menu field wherein, for an expanded submenu field located between two menu items, the first menu field is displayed as being separated into two first menu fields revealing the submenu field as an underlying layer therebetween; and

a selection indicator comprising a contour formed around a selected menu item in the expanded submenu field and a graphical layer effect applied to the contour to display the selection indicator as a layer above the underlying layer of the submenu field.

11. A computer program product for a graphical user interface system of a mobile telephone comprising:

a computer readable medium having computer readable program code embodied therein, the computer readable program code comprising:

computer readable program code configured to provide a first menu field carrying a list of menu items, at least one of the menu items indicating a submenu field which is expandable within the first menu field;

computer readable program code configured to apply a graphical layer effect to an expanded submenu field such that the expanded submenu field is displayed as a different layer than the first menu field and for an expanded submenu field located between two menu items, the first menu field is displayed as being separated into two first menu fields revealing the submenu field as an underlying layer therebetween; and

computer readable program code configured to display a selection indicator comprising a contour formed around a selected menu item in the expanded submenu field and a graphical layer effect applied to the contour to display the selection indicator as a layer above the underlying layer of the submenu field.

12. A portable communication terminal comprising a display and a means for executing a presentation on the display of a graphical user interface, the graphical user interface comprising a first menu field carrying a list of menu items, at least one of the menu items indicating a submenu field which is expandable within the first menu field, wherein a graphical layer effect is applied to an expanded submenu field such that the expanded submenu field is displayed as a different than the first menu field, and wherein, for an expanded submenu field located between two menu items, the first menu field is displayed on the graphical user interface as being separated into two first menu fields revealing the submenu field as an underlying layer therebetween, and the graphical user interface further comprises a selection indicator comprising a contour formed around a selected menu item in the expanded submenu field and a graphical layer effect applied to the contour to display the selection indicator as a layer above the underlying layer of the submenu field.