Spoken dialog device, spoken dialog method, and recording medium

A spoken dialog method realized using a receiving unit, a language identifier acquisition unit, a speech recognition unit, a dialog control unit, a speech synthesizing unit, and a speech output unit, the spoken dialog method comprising:

• a receiving step in which the receiving unit receives an input speech that is spoken in any of two or more different languages;
• a language identifier acquisition step in which the language identifier acquisition unit acquires a language identifier that identifies a language in which the input speech was spoken;
• a speech recognition step in which a speech recognition unit generates a text resulting from speech recognition, based on the input speech and the language identifier;
• a dialog control step in which the dialog control unit generates an output sentence based on the result of speech recognition and the language identifier;
• a speech synthesizing step of generating a speech waveform based on the output sentence and the language identifier;
• and
• a speech output step in which the speech output unit outputs a speech based on the speech waveform acquired in the speech acquisition step.

A recording medium on which a program is recorded, the program causing a computer to function as:

• a receiving unit that detects a voice section from a start point to an end point of an input speech that is spoken in any of two or more different languages, and acquires speech data corresponding to the voice section;
• a language identifier acquisition unit that acquires a language identifier that identifies a language in which the input speech was spoken;
• a speech recognition unit that generates a text resulting from speech recognition based on the input speech and the language identifier;
• a dialog control unit to which a text resulting from speech recognition and a language identifier are input, and that generates a different output sentence depending on a language identifier, while maintaining dialog history even when the language identifier is different from the previous language identifier;
• a speech synthesizing unit that generates a speech waveform based on the output sentence and the language identifier;
• and
• a speech output unit that outputs a speech that is based on a speech waveform acquired by the speech synthesizing unit.