A display control apparatus comprising: an image data acquisition unit configured to acquire image data from a rear camera configured to shoot a rear view of a vehicle; a display image generation unit configured to generate display image data in which a pair of predicted course lines and a plurality of assisting lines (211, 212, 213, 214) are superimposed on the image data acquired by the image data acquisition unit, the pair of predicted course lines corresponding to a width of the vehicle and being drawn according to a backward movement of the vehicle, the plurality of assisting lines (211, 212, 213, 214) being disposed so that they are arranged side by side in a width direction on both sides of the pair of predicted course lines; an extraction unit configured to extract a marked-off space boundary from the image data, the marked-off space boundary being a boundary in a width direction of a marked-off parking space where the vehicle can be parked; a positional relation determination unit configured to determine a positional relation between the marked-off space boundary extracted by the extraction unit and the assisting line (211, 212, 213, 214) in the display image data; a display control unit configured to display an image based on the display image data generated by the display image generation unit in a display unit, wherein the display image generation unit changes a displaying format of an assisting line (211, 212, 213, 214) located on an outer side of the marked-off space boundary extracted by the extraction unit from a displaying format of an assisting line (211, 212, 213, 214) located on an inner side of the marked-off space boundary; and wherein the display image generation unit generates the display image data in which an assisting line (211, 212, 213, 214) closer to the predicted course line is superimposed on the image data in a more noticeable displaying format. an image data acquisition unit configured to acquire image data from a rear camera configured to shoot a rear view of a vehicle; a display image generation unit configured to generate display image data in which a pair of predicted course lines and a plurality of assisting lines (211, 212, 213, 214) are superimposed on the image data acquired by the image data acquisition unit, the pair of predicted course lines corresponding to a width of the vehicle and being drawn according to a backward movement of the vehicle, the plurality of assisting lines (211, 212, 213, 214) being disposed so that they are arranged side by side in a width direction on both sides of the pair of predicted course lines; an extraction unit configured to extract a marked-off space boundary from the image data, the marked-off space boundary being a boundary in a width direction of a marked-off parking space where the vehicle can be parked; a positional relation determination unit configured to determine a positional relation between the marked-off space boundary extracted by the extraction unit and the assisting line (211, 212, 213, 214) in the display image data; a display control unit configured to display an image based on the display image data generated by the display image generation unit in a display unit, wherein the display image generation unit changes a displaying format of an assisting line (211, 212, 213, 214) located on an outer side of the marked-off space boundary extracted by the extraction unit from a displaying format of an assisting line (211, 212, 213, 214) located on an inner side of the marked-off space boundary; and wherein the display image generation unit generates the display image data in which an assisting line (211, 212, 213, 214) closer to the predicted course line is superimposed on the image data in a more noticeable displaying format.