A high-quality image pickup is performed even when there is a strong reflector, and image pickup and therapy are performed without reducing overall sound pressure even when there is a site which should not be exposed to a high sound pressure. Data for setting a desired beam is acquired, the position and intensity of a site to be avoided are detected from the data, the position and intensity are converted into a desired beam shape, focus data to form a beam along the desired beam shape is calculated, and the focus data is used to perform image generation or treatment.