11. An apparatus for retrieving a similar music by using a music content summary, the apparatus comprising: a music content summary generation unit extracting an audio feature value from a music file by decoding only a select compressed portion of the music file of all compressed portions of the music file, wherein the select compressed portion includes the extracted audio feature value, extracting the audio feature from the decoded portion, and generating the music content summary using the extracted audio feature value; a first feature extraction unit extracting an MDCT-based timbre feature and an MDCT-based tempo feature from the generated music content summary; a mood/genre classification unit classifying a mood and a genre of the music file according to the feature extracted by the first feature extraction unit; a second feature extraction unit extracting a similarity feature for a similarity retrieval from the music content summary; a database storing information on the classified mood and genre and the extracted similarity feature information; a music input unit receiving a query music; query music detection unit detecting a mood and a genre of the query music; and a retrieval unit measuring a similarity between the query music and music files that are identical in the mood and the genre to the query music and retrieving the similar music with respect to the query music according to the measured similarity.
11. An apparatus for retrieving a similar music by using a music content summary, the apparatus comprising: a music content summary generation unit extracting an audio feature value from a music file by decoding only a select compressed portion of the music file of all compressed portions of the music file, wherein the select compressed portion includes the extracted audio feature value, extracting the audio feature from the decoded portion, and generating the music content summary using the extracted audio feature value; a first feature extraction unit extracting an MDCT-based timbre feature and an MDCT-based tempo feature from the generated music content summary; a mood/genre classification unit classifying a mood and a genre of the music file according to the feature extracted by the first feature extraction unit; a second feature extraction unit extracting a similarity feature for a similarity retrieval from the music content summary; a database storing information on the classified mood and genre and the extracted similarity feature information; a music input unit receiving a query music; query music detection unit detecting a mood and a genre of the query music; and a retrieval unit measuring a similarity between the query music and music files that are identical in the mood and the genre to the query music and retrieving the similar music with respect to the query music according to the measured similarity. 17. The apparatus of claim 11 , wherein the music file includes any one of a moving picture experts group audio layer-3 (MP3) file and an advanced audio coding (ACC) file.