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. 11. The apparatus according to claim 8 , wherein the dialog unit refers to a plurality of states in which the unusable items have been used and designates, in accordance with the states, an item which is associated with a part of the speech-recognition grammars, and the detecting unit deletes the part from the managing unit.