Unlike the conventional speech communication system, which is difficult to recycle conversation knowledge that requires a high cost of construction and time, it is possible to build up and package conversational knowledge for each task having a hierarchical structure so as to enhance their recyclability, The present invention relates to a dual conversation management-based speech communication system and method using a hierarchical conversation task library capable of dividing tasks in units of tasks and constructing and managing conversation knowledge in a dialog planning manner.;
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