A display control apparatus comprising: a video image data acquisition unit configured to acquire video image data from a camera that captures an image of a travelling direction of a vehicle; a superimposed data generator configured to generate, based on a travelling operation of the vehicle, superimposed data indicating a position located away from the vehicle by a predetermined distance in the travelling direction of the vehicle; a display video image generator configured to generate display video image data in which the superimposed data is superimposed on the video image data; and a display controller configured to cause a display unit to display a video image by the display video image data generated by the display video image generator, wherein the display video image generator generates the display video image data in such a way that the display controller causes the display unit to display the superimposed data in such a way that display forms of the plurality of pieces of respective superimposed data are changed sequentially from a far side of the vehicle at a predetermined time interval, wherein: the display control apparatus generates a plurality of auxiliary lines indicating distances from the vehicle in the travelling direction of the vehicle as the plurality of pieces of superimposed data; the display video image generator generates the display video image data in such a way as to sequentially change the display forms at a predetermined time interval from the auxiliary line on a far side with respect to the travelling direction of the vehicle; the display control apparatus comprises an extraction unit configured to extract a deep-side division line that corresponds to a deep-side border of a parking section from the video image data; and the display video image generator generates the display video image data in such a way as to change the display forms from the auxiliary line on the far side using, as a trigger timing, a timing when an auxiliary line among the plurality of auxiliary lines that is arranged on a far side of the vehicle with respect to the travelling direction of the vehicle has reached a position that corresponds to the deep-side division line. a video image data acquisition unit configured to acquire video image data from a camera that captures an image of a travelling direction of a vehicle; a superimposed data generator configured to generate, based on a travelling operation of the vehicle, superimposed data indicating a position located away from the vehicle by a predetermined distance in the travelling direction of the vehicle; a display video image generator configured to generate display video image data in which the superimposed data is superimposed on the video image data; and a display controller configured to cause a display unit to display a video image by the display video image data generated by the display video image generator, wherein the display video image generator generates the display video image data in such a way that the display controller causes the display unit to display the superimposed data in such a way that display forms of the plurality of pieces of respective superimposed data are changed sequentially from a far side of the vehicle at a predetermined time interval, wherein: the display control apparatus generates a plurality of auxiliary lines indicating distances from the vehicle in the travelling direction of the vehicle as the plurality of pieces of superimposed data; the display video image generator generates the display video image data in such a way as to sequentially change the display forms at a predetermined time interval from the auxiliary line on a far side with respect to the travelling direction of the vehicle; the display control apparatus comprises an extraction unit configured to extract a deep-side division line that corresponds to a deep-side border of a parking section from the video image data; and the display video image generator generates the display video image data in such a way as to change the display forms from the auxiliary line on the far side using, as a trigger timing, a timing when an auxiliary line among the plurality of auxiliary lines that is arranged on a far side of the vehicle with respect to the travelling direction of the vehicle has reached a position that corresponds to the deep-side division line. the display control apparatus generates a plurality of auxiliary lines indicating distances from the vehicle in the travelling direction of the vehicle as the plurality of pieces of superimposed data; the display video image generator generates the display video image data in such a way as to sequentially change the display forms at a predetermined time interval from the auxiliary line on a far side with respect to the travelling direction of the vehicle; the display control apparatus comprises an extraction unit configured to extract a deep-side division line that corresponds to a deep-side border of a parking section from the video image data; and the display video image generator generates the display video image data in such a way as to change the display forms from the auxiliary line on the far side using, as a trigger timing, a timing when an auxiliary line among the plurality of auxiliary lines that is arranged on a far side of the vehicle with respect to the travelling direction of the vehicle has reached a position that corresponds to the deep-side division line.