An ultrasonic diagnostic apparatus includes a probe including a transducer which transmits an ultrasound signal to a target, receives the ultrasound signal reflected from the target, and transduces the received ultrasound signal into an analog signal; an A/D converter which converts the analog signal output by the probe into a digital signal; a compression unit which compresses the digital signal output from the A/D converter; and a host computer which decompresses the digital signal compressed by the compression unit and performs beamforming.