Disclosed is a display device and a display method. The display device includes: an image processor which is capable of processing a plurality of images comprising a first image and auxiliary images that may be selectively displayed together with the first image; a display which displays the plurality of images thereon by making the auxiliary images visible corresponding to viewing angles; and a controller which controls the plurality of images to comprise at least one of a first auxiliary image, a second auxiliary image that is different from the first auxiliary image and a third auxiliary image that is used to reduce an interference between the first and second auxiliary image.