21. A method of speech dialogue between a human user and a speech dialogue system, comprising the steps of: understanding an input speech from a user; determining a response output according to the input speech; generating a speech response and a visual response according to the response output; and outputting the speech response and the visual response generated to the user.
21. A method of speech dialogue between a human user and a speech dialogue system, comprising the steps of: understanding an input speech from a user; determining a response output according to the input speech; generating a speech response and a visual response according to the response output; and outputting the speech response and the visual response generated to the user. 24. The method of claim 21, further comprising the step of detecting a state of the user, and wherein the determining step determines the response output by taking the state of the user detected at the detecting step into account.