A method for providing a voice assistant service of an electronic device may include: detecting a voice assistant update; determining whether a supportable utterance exists in an updated list; based on there being a supportable utterance in the updated list, comparing utterances stored in a database with the updated list and determining whether a matched utterance exists; based on there being a matched utterance, storing the matched utterance as a recommended utterance list; and recommending an utterance based on the recommended utterance list.