Patent ID: 8519986

Claim:
A user interface device comprising: a display unit to display a first menu comprising one or more selectable menu items parallel to a first direction and a second direction and a selection mark; an input unit comprising: a movement instruction unit to output a movement signal instructing a movement of the selection mark in the first direction or the second direction among the one or more selectable menu items parallel to the first direction and the second direction, and a rotation unit that is rotatable to output a rotation signal instructing a selection of a selectable menu item distinguished by the selection mark in the display unit; wherein the movement instruction unit is rotated along with the rotation unit, and outputs a movement signal instructing a movement of the selection mark in a third direction or a fourth direction perpendicular to the first and second directions when the rotation unit is rotated in a first rotation direction; and a control unit to generate a second menu corresponding to the selectable item distinguished by the selection mark and to control the display unit to display the generated second menu, the second menu comprising menu items arranged parallel to the third and fourth directions, when a first rotation signal indicating that the rotation unit is rotated in the first rotation direction from the rotation unit, and remove the second menu from the display unit when a second rotation signal indicating that the rotation unit is rotated in a second rotation direction from the rotation unit.