1. A vehicular manipulation input apparatus comprising: a display device having a screen to display; a display control circuit configured to cause the display device to display on the screen a selection-use window under a hierarchical structure, the selection-use window containing a plurality of selection regions; and a manipulation device to select one of the plurality of selection regions in the selection-use window and perform a determination input to the selected one, wherein the selection-use window includes a high layer window, the high layer window containing, within the plurality of selection regions, at least one window switchover region, which enables a window switchover to switch from the high layer window to a predetermined low layer window when receiving the determination input performed by the manipulation device, the display control circuit being further configured to: (i) display, in the high layer window, a first correspondence image, the first correspondence image indicating visually a correspondence relation with the window switchover region, and having at least one of a color and a patterned design, the at least one of the color and the patterned design being unique to the window switchover region; (ii) switch into the low layer window corresponding to the window switchover region when the manipulation device selects the window switchover region out of the plurality of selection regions and performs the determination input to the selected window switchover region; and (iii) display, in the low layer window, a second correspondence image, the second correspondence image having a visual association, in respect of at least one of a color and a patterned design, with the first correspondence image corresponding to the window switchover region to which the determination input was performed by the manipulation device.