1. A method for extracting voiced/unvoiced classification information using a harmonic component of a voice signal, the method comprising the steps of: converting an input voice signal into a voice signal of a frequency domain; calculating a harmonic signal and a residual signal other than the harmonic signal from the converted voice signal; calculating a harmonic to residual ratio (HRR) using a calculation result of the harmonic signal and residual signal; and classifying voiced/unvoiced sounds by comparing the HRR with a threshold value.