A user interface apparatus includes a first display unit that is configured to display a plurality of first items, a wheel input unit that is positioned proximate a first side of the first display unit, a button input unit that is positioned within a circumference of the wheel input unit, and a second display unit that is positioned within the circumference of the wheel input unit. The wheel input unit is rotatable and is configured to, based upon being rotated, output a scroll command to scroll the plurality of first items. The button input unit is configured to, based upon being pressed, output a selection command to select a first item from the plurality of first items. The second display unit is configured to display the selected first item.