In a navigation device, multi-layered menu windows are sequentially displayed in a display unit and narrowed down by repeatedly selecting an item in each menu window to thereby consequently display a certain instruction window for instructing an execution of a function. This selection procedure is stored such that a selection record, which indicates an association with the certain instruction window, is assigned to each of the selected items in the displayed menu windows. When a certain item assigned the selection record is operated more than a predetermined time period, the currently displayed menu window including the certain item is switched to the certain instruction window without intermediate menu windows displayed. Thus, when intending to display the certain instruction window, which was previously displayed after the selection procedure, a user can significantly simplify the selection procedure and decrease workloads.