1. A system for aligning a window to extract a peak feature of a voice signal, the system comprising: a peak information extraction unit for extracting peak information from a received voice signal; an update point determination unit for determining a window update point using the peak information; a window length determination unit for determining a window length by shifting a window based on the update point; a window alignment unit for aligning a window according to the determined window length; and a window analysis unit for performing window analysis for feature extraction by detecting start and end points of the window from the aligned window.