An apparatus for detecting an end point using decoding information includes: an end point detector configured to extract a speech signal from an acoustic signal received from outside and detect end points of the speech signal; a decoder configured to decode the speech signal; and an end point detector configured to extract reference information serving as a standard of actual end point discrimination from decoding information generated during the decoding process of the decoder, and discriminate an actual end point among the end points detected by the end point detector based on the extracted reference information.