1. An ultrasonic diagnostic equipment comprising: image acquisition means for acquiring image data by scanning a patient into whom an ultrasonic contrast medium has been injected, with ultrasonic beams; same-part correspondence means for bringing same parts into correspondence with each other, between a plurality of images concerning the same parts of the identical patient and taken by said image acquisition means; arithmetic operation means for arithmetically operating image information items on changes of intensities between the plurality of images by using the intensities of those mutually corresponding pixels of the plurality of images which have been brought into correspondence by said same-part correspondence means; and display means for displaying results operated by said arithmetic operation means.