PROBLEM TO BE SOLVED: To display the appropriate image for observation of a subject patient without need for any additional complicated work for the display when he/she is diagnosed.SOLUTION: A plurality of numerical data set for the observation image of the patient set by an operator (brightness level, red and blue color levels, enhancement, emphasis on the contrast and noise reduction) are recorded in an external memory in relation with the patients private information. Besides, when a new diagnosis is repeated on the same patient, a list LS of a series of image related numerical data and the data-based preview images IM1 to IM3 set up and registered in the past are displayed on a monitor by search operations. After the operator selects and decides on a combination of some image related set data, then he enforces the processing and adjustment of the observation image shown on the monitor according to these image related set data.
