In transmissions of each frame through intermittent transmissions, by performing ultrasonic wave transmissions while increasing a mechanical function step by step, destructions of bubbles of a contrast medium can be induced step by step according to their different sizes. By generating ultrasonic images using the destructions at the respective steps as the sources of echoes, it is possible to provide new ecological information including, for example, information reflecting the dynamics of substances smaller than the red blood cells, the distribution of predatory cells, new diagnosis information, etc.
