12. The method of claim 9 , wherein generating dialog prosody information includes: generating discourse information for the semantic structure of the system utterance based on the speech act of the user utterance; generating prosody information, including an utterance boundary level, for the discourse information of the semantic structure; and generating an intonation pattern for the semantic structure of the system utterance based on the prosody information.
12. The method of claim 9 , wherein generating dialog prosody information includes: generating discourse information for the semantic structure of the system utterance based on the speech act of the user utterance; generating prosody information, including an utterance boundary level, for the discourse information of the semantic structure; and generating an intonation pattern for the semantic structure of the system utterance based on the prosody information. 14. The method of claim 12 , wherein generating dialog prosody information includes adjusting an emphasis tag on repeated information when the semantic structure and a surface structure of a current system utterance are identical to those of a previous system utterance.