1. A speech dialogue system, comprising: speech understanding means for understanding an input speech from a user; dialogue management means for determining a response output content according to the input speech understood by the speech understanding means; response generation means for generating a speech response and a visual response according to the response output determined by the dialogue management means; and output means for outputting the speech response and the visual response generated by the response generation means to the user.
1. A speech dialogue system, comprising: speech understanding means for understanding an input speech from a user; dialogue management means for determining a response output content according to the input speech understood by the speech understanding means; response generation means for generating a speech response and a visual response according to the response output determined by the dialogue management means; and output means for outputting the speech response and the visual response generated by the response generation means to the user. 8. The speech dialogue system of claim 1, wherein the speech understanding means supplies a plurality of candidates for the input speech, and the dialogue management means determines the response output by evaluating said plurality of candidates in accordance with a dialogue history/state.