6. The speech communication system according to claim 4 , wherein upon the failure to track the position of the conversation partner by the tracking control unit, the speech contents of the conversation partner not matching the predicted response, and the response to said notification is not received after the notification is repeated the prescribed number of times, another notification is issued to request the conversation partner to physically contact the contact recognition unit, and the conversation control unit is configured to continue the conversation based on the recognition result of the contact recognition unit indicating that the conversation partner physically contacted the contact recognition unit.
4. The speech communication system according to claim 1 , further comprising: a contact recognition unit configured to recognize a physical contact of the conversation partner with the contact recognition unit, wherein the tracking control unit is configured to track the position of the conversation partner based on a combination of the recognition result of the speech recognition unit, the recognition result of the image recognition unit, and a recognition result of the contact recognition unit.