13. The apparatus of claim 10 , wherein the facial expression analyzer comprises: an image normalizer that normalizes the user face image so as to have a predetermined size and color; a face pattern database that stores data on feature points for recognition of face, eye, eyebrow, and eyelid patterns; a face pattern searcher that searches the face pattern database to obtain information on locations of face, eye, eyebrow, and eyelid patterns of the normalized face image; a movement information generator that compares the obtained position information with information on locations of standard patterns to generate movement information; a facial expression pattern database that stores information on facial expression patterns corresponding to the determined movement information and dialog turns of current speakers; and a facial expression pattern searcher that searches the facial expression pattern database using the movement information to generate the second dialog turn information.
10. An apparatus for managing a dialog turn between a user and a spoken dialog system including a computer having computing device-executable instructions, the apparatus comprising: a dialog analyzer, controlled by the computer, that generates first dialog turn information using dialog information analyzed from a speech uttered by the user; a facial expression analyzer, controlled by the computer, that generates second dialog turn information using facial expression information analyzed from a face image of the user; a weight database, controlled by the computer, that stores weights assigned to varying dialog turn information based on statistical information; a synthesizer, controlled by the computer, that synthesizes the first dialog turn information and the second dialog turn information, the synthesizer outputting the synthesized dialog turn information to a weight searcher when the first dialog turn information is different than the second dialog turn information and outputting one selected from the first dialog turn information and the second dialog turn information to a dialog controller when the first dialog turn information is identical to the second dialog turn information; the weight searcher searching the weight database for weights corresponding to the synthesized dialog turn information output from the synthesizer, assigning a positive weight to each of the first and second dialog turn information based on the synthesized dialog turn information and selecting whichever one of the first and second dialog turn information has a greater positive weight; and the dialog controller determining a final dialog turn using the selected one dialog turn information, information on a status of the spoken dialog system, information on whether the user speech is input, and information on a no-answer time of the user, for controlling a dialog between the user and the spoken dialog system.