1. A method of performing microphone beamforming, the method comprising: distinguishing at least a portion of received sound as speech by a speaker from noise; identifying the speaker by comparing the received speech with previously stored speech in a data storage to obtain an identification of the speaker; based on the identification of the speaker, searching images stored in the data storage for a stored image associated with the identified speaker; searching for a position of the identified speaker through a camera by comparing the stored image of the identified speaker with image data received through the camera; recognizing the position of the identified speaker; and performing microphone beamforming according to the position of the identified speaker.