51. The language dialogue method as recited in claim 47 , wherein the step of revising the user's preference data stored into the properties database according to the first user's preference data comprises: searching one of the records corresponding to the first keyword from the records stored in the properties database; and in the record corresponding to the first keyword, revising the public preference record data or the public dislike record data included in the corresponding record according to a user's preference indication corresponding to the first keyword included in the first user's preference data.
51. The language dialogue method as recited in claim 47 , wherein the step of revising the user's preference data stored into the properties database according to the first user's preference data comprises: searching one of the records corresponding to the first keyword from the records stored in the properties database; and in the record corresponding to the first keyword, revising the public preference record data or the public dislike record data included in the corresponding record according to a user's preference indication corresponding to the first keyword included in the first user's preference data. 52. The language dialogue method as recited in claim 51 , wherein if the one of the records corresponding to the first keyword is not searched from the properties database, a new record is established in the properties database according to the first keyword, and the public preference record data corresponding to the new record and the public dislike record data corresponding to the new record are revised according to the user's preference indication corresponding to the first keyword.