Abstract: An ultrasonic diagnostic system, which is intended to perform the wireless communication of ultrasonic diagnostic information within the speed range of general-purpose data communication standards, is arranged in a first and second units. The first unit includes ultrasonic wave transmit/receive means which transmits an ultrasonic wave and receives the echo of the wave, data generation means which produces digital diagnostic data based on the received echo, data compression means which compresses the digital data, and data communication means which sends out the compressed data in wireless manner. The second unit includes data communication means which receives the transmitted data, data expansion means which expands the received data, and information generation means which produces display information from the expanded data.