A clinical apparatus includes an ultrasound transducer having at least one oscillator, a transmitter circuit which supplies drive signals to the oscillator of the ultrasound transducer, a receiver circuit which receives echo signals outputted from the oscillator of the ultrasound transducer and which performs phase matching processing on the echo signals, and a data processor which yields superimposed echo signals by superimposing plural beams generated in different directions, where the plural beams are generated by performing at least one of (i) a mechanical scan, (ii) transmission and reception of steered beams in the different directions, and (iii) aperture synthesis in the different directions with respect to the received echo signals.