PURPOSE: To realize the voice recognizing system using a BPF bank, which can cope easily with a variation of a talker (a difference of a person and a variation of the same person's physical condition), and also, has a high recognition rate.

CONSTITUTION: As BPFs 31-3n for constituting a BPF bank 3, those which can vary at least the center frequency are applied. A filter characteristic updating part 7a optimizes a filter characteristic of the BPFs 31-3n in accordance with a talker (in accordance with a difference of a person, or a difference of the same person's physical condition, etc.). Thereafter, a voice recognition processing is executed.