According to certain embodiments, a wearable electronic device comprises: a housing; a first electrode and a second electrode disposed on the housing; an A/D converter connected to the first electrode and the second electrode; a pulse generator connected to the first electrode and the second electrode; and a processor operatively connected to the A/D converter and the pulse generator; wherein the processor is configured to: control the pulse generator to output a series of pulse waves to the first electrode when an external object is in contact with the first electrode; and controlling the A/D converter to obtain biometric information from the first electrode and second electrode in response to outputting the series of pulse waves.