1. A system of a vehicle for compositing various images, the system comprising: a processor operating a computer program to receive two or more input images; composite the two or more input images into one composite image; calculate a brightness distribution degree of each input image in the composite image and representative brightness values of one or more increase/decrease curves (modal) in the brightness distribution degree; determine at least one of a clustering of each input image, and a clustering type of each input image through the representative brightness value, and a grouping of respective increase/decrease curves; calculate a correction target value of each group through the representative brightness values of the grouped increase/decrease curves and subtracting the representative brightness value of each increase/decrease curve of a corresponding group from the correction target value of each group to calculate a correction value of each increase/decrease curve; and correct brightness by adding the correction value corresponding to the pixel value of each input image.