15. A system for extracting the structure of song lyrics using a repeated pattern of the song lyrics, the system comprising: a memory for storing an audio file; a key input unit for receiving predetermined key input signals generated by a user's selection; an audio file management unit for managing an operation related to the audio file when the key input signals indicate a request for the audio file; a lyric structure generator for analyzing the song lyrics extracted from metadata contained in the audio file, extracting a repeated character string and a paragraph, and arranging information about the song lyrics in a tree structure; and a controller which extracts a portion of the audio file based on the tree structure and outputs the extracted portion of the audio file on an audio playing device.
15. A system for extracting the structure of song lyrics using a repeated pattern of the song lyrics, the system comprising: a memory for storing an audio file; a key input unit for receiving predetermined key input signals generated by a user's selection; an audio file management unit for managing an operation related to the audio file when the key input signals indicate a request for the audio file; a lyric structure generator for analyzing the song lyrics extracted from metadata contained in the audio file, extracting a repeated character string and a paragraph, and arranging information about the song lyrics in a tree structure; and a controller which extracts a portion of the audio file based on the tree structure and outputs the extracted portion of the audio file on an audio playing device. 16. The system of claim 15 , wherein the portion of the audio file output by the controller includes information about the extracted paragraph, wherein the information about the extracted paragraph is based on at least one of: a number of repetitions of the extracted paragraph; a ratio of a length of the repeated character string in the extracted paragraph to a length of all character strings in the lyric information; a total length of character strings in the extracted paragraph, wherein the total length is based on a length of the character strings in the extracted paragraph and the number of repetitions of the extracted paragraph; a type of all verses in which the extracted paragraph occurs; and whether the extracted paragraph is before or after the interlude.