1. A system for aligning a window to extract a peak feature of a voice signal, the system comprising: a peak information extraction unit configured to receive a voice signal and extract peak information from the received voice signal; a peak order determination unit configured to receive the peak information from the peak information extraction unit and determine a peak order based on the extracted peak information; an update point determination unit configured to receive the peak order information from the peak order determination unit and determine a window update point using peak information of the peak order determined by the peak order determination unit; a window length determination unit configured to determine a window length by shifting a window based on the update point; a window alignment unit configured to align a window according to the determined window length; and a window analysis unit configured to perform window analysis for feature extraction by detecting start and end points of the window from the aligned window, wherein the system is implemented by at least one processor, and wherein 1 st order peaks of a signal include peaks of the signal, and (n+1) th order peaks of the signal are peaks of a signal represented by line segments directly connecting adjacent n th order peaks, where n is an integer greater than or equal to 1.