1. A method for production of speech reference templates for phoneme groups for use in speech recognition, each of said phoneme groups containing at least one phoneme, the method comprising the steps of: preparing first speech patterns with respect to speeches of plural speakers, said first speech patterns corresponding to a word which is stable by utterance; classifying said speeches of said plural speakers into speech groups by use of differences in said first speech patterns caused by physical features of said speakers; preparing second speech patterns with respect to said speeches of said plural speakers, said speech patterns corresponding to a phoneme group containing at least one phoneme; subclassifying the speeches of said plural speakers in each of said speech groups into speech subgroups by the use of differences in said second speech patterns caused by features of speech occurring by utterance; and selecting a plurality of second speech patterns among the second speech patterns in each of said speech subgroups and assigning said selected plurality of second speech patterns to be the speech reference template for each of said phoneme groups.