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 separate 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 of the plurality of separate selection regions, wherein the selection-use window includes a high layer window including a background image with the plurality of separate selection regions being displayed separately on the background image of the 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 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 on the background image, the first correspondence image visually corresponding to the window switchover region, the first correspondence image having a first color different from a color of the background image of the high layer window, the first correspondence image being the only image in the high layer window having the first color; (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, that automatically has a second color, the second correspondence image being a background image of the low layer window; wherein the second color is within an approximate hue of the first color of the first correspondence image corresponding to the window switchover region to which the determination input was performed by the manipulation device.