Disclosed are a communication device for performing beamforming and an operating method thereof. The communication device includes: an antenna array configured to simultaneously form a first vertical beam and a second vertical beam for an arbitrary time; a transceiver configured to transmit and receive a signal using a double beam including the first vertical beam and the second vertical beam; and a processor configured to determine a first optimal vertical tilting angle of the first vertical beam based on Inter-Beam Interference (IBI) of the second vertical beam, and determine a second optimal vertical tilting angle of the second vertical beam based on the IBI of the first vertical beam.