The present invention provides a three-dimensional digital entity magnifying glass technique-assisting and training/educational distribution system incorporating three-dimensional visual training functions by means of image composition that enables a three-dimensional visual instruction containing a depth when giving visual instructions to an HMD worn by a medical practitioner to thereby display only images of a pointing device or various kinds of instruments among image information of the instructor's CCD camera and synchronously and compositely displaying a three-dimensional visual training image output from an image-processing apparatus that can display an after-image of the image for an arbitrary time setting into image information of the CCD camera, thereby providing equal-scaling display of image information to which an instruction and a comment by use of a visual display/instruction image are added three-dimensionally as well as an instrument actually used by the instructors (groups of lecturers) on the three-dimensional HMD of the medical practitioner.