A dialogue device according to an embodiment includes an acquisition unit configured to acquire a user utterance input by the user, an identification unit configured to identify a situation of the user utterance as an utterance situation, a selection unit configured to select a scenario corresponding to the user utterance from a database storing a plurality of scenarios, and an output unit configured to output a system utterance defined by the selected scenario. Each scenario defines a user utterance, a system utterance for the user utterance, and hierarchically defined scenario attributes. When two or more scenarios defining a user utterance are present as candidate scenarios in a database, the selection unit selects one scenario from the two or more candidate scenarios based on a hierarchical relationship among the two or more scenario attributes defined in the two or more candidate scenarios and the utterance situation.