Patent ID: 8312386

Claim:
A display device comprising: a display unit including a first portion, a second portion, and a third portion that are different from one another; a first display control unit configured to display one of a plurality of screen images on the first portion, the plurality of screen images including a base screen image and being arranged hierarchically from the base screen image, the first display control unit changing 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, each screen image having a hierarchical level indicating where the screen image is positioned; a title string storing unit configured to store a plurality of title strings, each title string indicating one of the plurality of screen images; a navigation string creating unit configured to create a navigation string including 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 navigation string excluding a title string of the current screen image, the navigation string further including hierarchical numbers each corresponding to one of the title strings included in the navigation string, each hierarchical number indicating a hierarchical level of one of the screen images which is positioned in the part of the screen navigation path, each hierarchical number being disposed between the corresponding title string and a title string adjacent to the corresponding title string; a second display control unit that is configured to display the navigation string on the second portion; a current string creating unit configured to create a current string by adding a hierarchical number indicating the hierarchical level of the current screen image to the title string corresponding to the current screen image; a third display control unit configured to display the current string on the third portion; and a scrolling unit 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.