The ultrasonic apparatus (1) for diagnosis and therapy includes: a first ultrasound probe (2), a second ultrasound probe (3), and an ultrasound exposure apparatus (4) for exposure by ultrasounds for phase transition, diagnosis, and therapy, respectively an echo detection device (2) for detecting an ultrasound echo control parts (53, 52) for the phase transition for causing a transition in an ultrasound contrast agent by exposure by ultrasound for the transition through the first probe, and for the diagnosis by detecting the transition of the agent, using the echo detected by the detection device, corresponding to an exposure by the ultrasound for the diagnosis by the second probe a difference calculation device (552) for calculating a difference over time of the transition detected by the control part for the diagnosis a position device (553) for deciding a target position where the difference is produced and a therapy control part (54) for exposure by the ultrasound for the therapy to the decided target position through the exposure apparatus.
