An ultrasonic diagnostic apparatus has first region display means for displaying an ultrasonic tomographic image or an endoscopic optical image on the full display screen of the monitor, second region display means for reducing the size of the endoscopic optical image and displaying the image on a part of the display screen of the monitor, third region display means for superimposing a blood flow dynamic state image on the ultrasonic tomographic image displayed on the display screen of the monitor, switching means for switching between the ultrasonic tomographic image and the endoscopic optical image displayed on the monitor by the first region display means while switching so as to display the endoscopic optical image by the second region display means and/or the blood flow dynamic state image by the third region display means when the ultrasonic tomographic image is displayed by the first region display means, and image quality adjusting means for adjusting luminance and hue suitable for the image displayed on the monitor by each region display means.
