A dialogue system having a plurality of dialogue domains is provided. The dialogue system having a plurality of dialogue domains, according to the present invention, comprises: a user interface that receives a user utterance from a user through a network and transmits a system utterance to the user; a dialogue domain management unit having a plurality of dialogue domains; a user utterance preprocessing unit that performs natural language processing on the user utterance by referring to a natural language comprehension unit having an action ontology and a fact ontology, constructs and vectorizes the user utterance into a semantic frame, and selects one of the plurality of dialogue domains by using the natural language processing result for the user utterance; a natural language analysis unit that detects an entity, an intention, and an anaphora from the semantic frame for the constructed user utterance, and searches for and detects the entity indicated by the detected anaphora; and a system utterance execution unit that performs an execution to generate a system utterance on the basis of the entity indicating the anaphora of the user utterance.