The thumbnail icons representing content items stored in a Memory Stick are displayed as aligned in a linear manner. The sequence of the alignment of the thumbnail icons follows the sequence of the sort icons displayed in the control area. By rotating the jog dial, the user can scroll the thumbnail icons displayed in the view area. Rotating the jog dial, the user displays the thumbnail icon representing a desired content item as a selected thumbnail icon (at the center) and then presses the jog dial. Consequently, the content item represented by the selected thumbnail icon is reproduced.