1. A display apparatus for a vehicle, the display apparatus comprising: a display comprising a screen; one or more devices configured to obtain at least one of internal and external information about a vehicle; and a control unit, comprising at least one processor, configured to: process the internal and/or external information into a single image or a plurality of images by using an image generator, and control the single image or the plurality of images to be changed according to a traveling mode of the vehicle, correct distortion of the image according to the traveling mode of the vehicle, or when the traveling mode of the vehicle is the high speed traveling mode, the control unit is configured to control a size of the single image or the plurality of images to be changed to be larger than when the traveling mode of the vehicle is the low speed traveling mode, and send the single image or the plurality of images to the display; wherein a resolution of the single image or the plurality of images is higher when the vehicle is a low speed traveling mode than when the vehicle is in a high speed traveling mode, when the traveling mode of the vehicle is the low speed traveling mode, the plurality of images are sent to the display, with varied projection distances of the plurality of images displayed on the screen of the vehicle for each image, and when a current vehicle speed is equal to or higher than a predetermined vehicle speed, the control unit is configured to set the traveling mode of the vehicle to the high speed traveling mode, and when the current vehicle speed is lower than a predetermined vehicle speed, the control unit is configured to set the traveling mode of the vehicle to the low speed traveling mode.