28. A similar word discrimination apparatus, comprising: means for successively receiving voice data of input words from the speech of multiple speakers; means for using a learning dynamic recurrent neural networks (DRNN) voice model to obtain a specified DRNN output showing a level of correctness in response to the voice data of each input word; means for processing the DRNN output to establish a specified period in which the characteristic components of each input words are included in the DRNN output, when the DRNN output shows a level of correctness of a predetermined amount or greater; means for encoding each input word voice data into code data by using a code book; means for creating histogram data, including a code histogram, from the coded data that includes characteristics for the specified period of each input word; means for accumulating standard histogram data by storing histogram data for each input word; means for comparing the histogram data of each input word with the standard histogram data; and means for discriminating between the input words and words that are similar to the input words on the basis of the comparison.
28. A similar word discrimination apparatus, comprising: means for successively receiving voice data of input words from the speech of multiple speakers; means for using a learning dynamic recurrent neural networks (DRNN) voice model to obtain a specified DRNN output showing a level of correctness in response to the voice data of each input word; means for processing the DRNN output to establish a specified period in which the characteristic components of each input words are included in the DRNN output, when the DRNN output shows a level of correctness of a predetermined amount or greater; means for encoding each input word voice data into code data by using a code book; means for creating histogram data, including a code histogram, from the coded data that includes characteristics for the specified period of each input word; means for accumulating standard histogram data by storing histogram data for each input word; means for comparing the histogram data of each input word with the standard histogram data; and means for discriminating between the input words and words that are similar to the input words on the basis of the comparison. 30. The similar word discrimination apparatus of claim 28, wherein the DRNN voice model creates correspondence between groups of words having similar word groups and generates a DRNN output showing the level of correctness at a predetermined level or greater for each of the similar word groups of the group of words.