In a system for diagnoses of mammary glands and breasts using radiation and ultrasonic waves in combination, images are correlated for easier visual recognition. The system includes an apparatus for acquiring a radiation image of an object projected on a projection surface, acquiring an ultrasonic slice image of the object along a slice surface substantially orthogonal to the projection surface, and generating first image data representing ultrasonic slice images along slice surfaces, second image data representing a radiation image, and location data representing locations of the slice surfaces on the projection surface an apparatus for correlating and storing those data and an apparatus for displaying an ultrasonic slice image based on the first image data, and displaying a radiation image, on which a marker indicating a location of the slice surface on the projection surface is shown, based on the second data and the location data.
