PURPOSE: To easily increase a vocabulary and speakers to be recognized by generating the standard pattern of an input voice.

CONSTITUTION: When an input voice is used for registration, a switch 12 is switched to the side of a standard pattern generation part 14 and the standard pattern of the vocabulary is generated for a voice pattern converted by a signal conversion part 11 by using data stored in a memory part 15. When the input voice is used for discrimination, the switch 12 is switching to the side of a similarity calculation part 13, the similarity between the registered standard pattern and input voice pattern is calculated and a decision part 17 outputs the standard pattern with the highest similarity. Standard patterns corresponding to three kinds of vocabulary of one speaker are registered in a memory part 16 for the standard patterns, but when a sufficient recognition result is obtained by the voicing of a different speaker, new voice registration is not performed.