1. A method for searching for recommended music using emotional information of music, the method being performed by a music search apparatus capable of searching for recommended music using the emotional information of music, comprising: inputting a search condition required to search for recommended music; if the input search condition is music information, searching a music emotion database (DB), which stores information about emotional values including valence values and arousal values of respective pieces of music, for emotional value information corresponding to the input music information; if emotional value information corresponding to the input music information is not retrieved in the music emotion DB, searching for the emotional value information corresponding to the input music information using an Arousal Valence (AV) regressor; extracting a combination of emotion ranks corresponding to the retrieved emotional value information by using an emotion model that includes information about mixed emotions corresponding to valence values and arousal values; searching the music emotion DB for music information corresponding to the extracted emotion rank combination; and outputting a recommended music list including the retrieved music information.