Abstract: The present invention relates to a technique for effectively processing a large amount of video data which are generated by cameras (e.g., CCTV cameras). Particularly, the present invention relates to a video processing technique of image quality compensation, in which a compensation of image quality is periodically performed by high-resolution image switching when video streams of a plurality of resolution (e.g., 4K, 1K (Full-HD)) are provided from a camera, thereby maintaining storage capacity for storing videos at the level of low-resolution video and maintaining an object identification effect in video search at the level of high-resolution video.