A wearable device according to an embodiment of the present disclosure of the present inventive concept, which is worn on a user's head to apply an electrical stimulation to a brain or measure brain waves from the brain, comprises: a wearing identification unit for identifying a worn state of the wearable device using a first sensor module detecting the worn state of the wearable device of a user； an electrode unit for applying an electrical stimulation to a user's brain or measuring brain waves from the user's brain； and a control unit for controlling the electrode unit to start the electrical stimulation or a brain wave measurement on the basis of the identification result by the wearing identification unit.
