1. A method for displaying medical image information comprising the steps of: detecting a position of an observer relative to a display screen; and in a processor provided with medical data sets respectively representing different medical diagnostic images of the same region of a subject, generating and displaying a superimposition of medical data sets, comprised of relative, respective contributions of each data set to the superimposition, to produce a displayed, superimposed image of said region on said display screen, and said processor setting said relative, respective contributions of each data set to said superimposition simultaneously with and solely dependent on the detection of the position of the observer relative to said display screen, and changing an appearance of said displayed superimposed image of said region to the observer by changing said relative, respective contributions simultaneously with and solely dependent on a change in the detection position of the observer.