1. A method of recognizing speech, the method comprising: (a) dividing first speech into frames using a processor, the first speech being input into a speech recognizing apparatus; (b) converting the frames of the first speech into frames of second speech by applying at least one conversion rule to each of the divided frames; and (c) using the speech recognizing apparatus to recognize the frames of the second speech, wherein (b) comprises converting an (n)th frame of the first speech into an (n)th frame of the second speech by reflecting an (n−1)th frame and at least one frame from among frames that are previously positioned with respect to the (n−1)th frame of the first speech, wherein n is a natural number.