13. The speech communication method according to claim 11 , further comprising: issuing another notification to request the conversation partner to physically contact the contact recognition unit 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 not received after the notification is repeated the prescribed number of times; and continuing the conversation based on the recognition result indicating the physical contact of the conversation partner.
11. The speech communication method according to claim 8 , wherein, the tracking the position of the conversation partner is further based on a combination of the speech recognition result, the image recognition result, and a contact recognition result obtained by recognizing a physical contact of the conversation partner with a contact recognition unit.