Patent ID: 7447632

Claim:
A voice authentication system, comprising: a standard template storage part in which a standard template that is generated from a registered voice of an authorized user and featured with a voice characteristic of the registered voice is stored preliminarily in a state of being associated with an identifier of the authorized user; an identifier input part that allows a user who intends to be authenticated to input an identifier; a voice input part that allows the user who intends to be authenticated to input a voice; a standard template selection part that selects, from the standard template storage part, a standard template corresponding to the identifier inputted through the identifier input part; a determination part that refers to the standard template selected by the standard template selection part, and determines whether or not the voice inputted through the voice input part is a voice of the authorized user him/herself and whether or not presentation-use information is to be outputted by referring to a predetermined determination reference; a presentation-use information extraction part that extracts information regarding a registered voice of the authorized user corresponding to the identifier inputted through the identifier input part, as presentation-use information to be presented to the user who intends to be authenticated; and a presentation-use information output part that outputs the presentation-use information to the user who intends to be authenticated, wherein the presentation-use information is information obtained from the registered voice of the authorized user corresponding to the identifier inputted through the identifier input part, is different from information used as the determination reference by the determination part, and is other than a text describing a speech content of the registered voice of the authorized user, and in the case where it is determined by the determination part that the presentation-use information is to be outputted, the presentation-use information extraction part extracts the presentation-use information, and the presentation-use information output part outputs the presentation-use information thus extracted.