29. The multimedia device of claim 26 , wherein the cluster classification unit classifies the new digital content through one of generating of a plurality of the clusters, extending of the plurality of the clusters, combining of the plurality of the clusters, or a combination thereof, without using a reference value.
29. The multimedia device of claim 26 , wherein the cluster classification unit classifies the new digital content through one of generating of a plurality of the clusters, extending of the plurality of the clusters, combining of the plurality of the clusters, or a combination thereof, without using a reference value. 30. The multimedia device of claim 29 , wherein the reference value is a reference image.