Disclosed is a speech recognition method of an artificial intelligence robot. The speech recognition method includes: receiving uttered speech information of a user from an external device; inputting the speech information to a pre-learned first intent analysis model, and determining an utterance intent of the user according to an output value of the first intent analysis; transmitting response information corresponding to the determined utterance intent of the user to the external device; receive evaluation information of the user on the response information from the external device; and generating a second intent analysis model by adding the evaluation information to learning data and learning the first intent analysis model. Accordingly, an intelligent device is capable of learning an accurate utterance intent even without error correction by a manager.