Akito Nagai

Spoken dialog system capable of performing natural interactive access

There is provided a spoken dialog system, in which an interactive operation is effectively carried out in a natural manner as to a speech containing words out of a set vocabulary. The spoken dialog system is arranged by comprising: an input storing unit for storing therein an input voice; a dictionary storing unit for classifying a key word to be recognized every item so as to define the classified key word; a dictionary selecting unit for selecting a key word from the dictionary storing unit to thereby output the selected key word as a recognized dictionary; a voice recognizing unit for recognizing the input voice with employment of the recognized dictionary selected from the dictionary selecting unit, and for outputting the extracted key word candidate in combination with the recognition section; a confirmed history storing unit for storing therein a key word candidate confirmed by a user as a determined key word; and a dialog managing unit for judging as to whether or not an input voice other than the determined key word is again recognized and for executing such operations that when the judgment result is the recognition to be once again performed, both an item and the determined key word are transferred as dictionary selection information to the dictionary selecting unit, and a section of an input voice other than the determined key word is updated as a re-recognition section. The updated confirmation section is also instructed to the voice recognizing unit.