The present disclosure in one or more embodiments provides a beamforming apparatus and method for enhancing beamforming resolution. The beamforming method comprises quasi-randomly selecting a driving frequency for each channel from two or more candidate frequencies setting a phase for each channel based on a wavelength of the driving frequency for each channel and a distance between a physical position of each channel and a focal point and generating the ultrasound waves at the multiple channels, according to the driving frequency and phase selected for each channel.
