Multi-imaging apparatus for displaying isotope radiation distribution images derived from scintillation cameras, including a single processor including circuitry which enables a plurality of separate images taken respectively by scintillation cameras to be displayed or exposed on photographic film, and a display system including a cathode ray tube display device in combination with a photographic camera unit. Plural sets of X and Y-coordinate signals along with unblanking signals supplied from a plurality of the scintillation cameras are processed and the different images of the radioisotope distribution taken respectively by the different scintillation cameras are exposed on a single frame of an X-ray film.