8. The apparatus according to claim 1 , wherein the dialog unit further comprises a receiving unit configured to receive an oral input from the user, the managing unit stores speech-recognition grammars in association with the items, the dialog unit recognizes the oral input from the user in accordance with the speech-recognition grammars, and the referring unit outputs the use-disapproval notice based on recognition results.
8. The apparatus according to claim 1 , wherein the dialog unit further comprises a receiving unit configured to receive an oral input from the user, the managing unit stores speech-recognition grammars in association with the items, the dialog unit recognizes the oral input from the user in accordance with the speech-recognition grammars, and the referring unit outputs the use-disapproval notice based on recognition results. 10. The apparatus according to claim 8 , wherein the detecting unit deletes a part of the speech-recognition grammars from the managing unit, the part being associated with an item for which the use-disapproval notice has been output.