PROBLEM TO BE SOLVED: To easily obtain past image-reading reports or case information that may be referenced when reading a medical image or in a conference.SOLUTION: When a medical image is captured by a medical image diagnosis device 10, a medical image storage device 20 retrieves a medical image similar to the captured medical image from among medical images stored in a data storage section, collects information relating to past image-reading reports or cases in which the retrieved medical image is used as a key image, and displays the collected information relating to the image-reading reports or the cases.