DISPLAY DEVICE CAPABLE OF SCROLLING NAVIGATION STRING OF CURRENT DISPLAY

A display device includes a display unit, a first display control unit, a title string storing unit, a navigation string creating unit, a second display control unit, and a scrolling unit. The display unit includes a first portion and a second portion. The first display control unit is configured to display one of a plurality of screen images on the first portion. The plurality of screen images includes a base screen image and being arranged hierarchically from the base screen image. The first display control unit changes a screen image to display from one to another of the plurality of screen images along a screen navigation path starting from the base screen image based on screen navigation data, the screen navigation data indicating relationships between the screen images. The title string storing unit is configured to store a plurality of title strings, each title string indicating one of the plurality of screen images. The navigation string creating unit is configured to create a navigation string including the title strings each corresponding to a screen image which is positioned in a part of the screen navigation path from the base screen image to a current screen image that is displayed on the first portion currently. The second display control unit is configured to display the navigation string on the second portion. The scrolling unit is configured to scroll the navigation string on the second portion in a longitudinal direction of the navigation string so that a part of the navigation string is displayed on the second portion at a time.