| 摘要 |
PROBLEM TO BE SOLVED: To provide a user interface which enables even a user who does not memorize the hierarchical relation of selection menus to easily select a desired item out of an item group in hierarchical structure by making a menu selection history clear from an upper layer including items which are not selected in the upper layer of selection menus. SOLUTION: An operation device for selecting a desired item out of an item group in hierarchical structure selects some items out of the item group displayed at a display part 10 through an input part 9, while a CPU 1 additionally displays an item group of a next layer based upon the selected item as child items of the selected item in a tree shape figure at the display part 10. |
