[Problem] To efficiently and effectively exchange information on medical image data. [Solution] A video image extracted from a DICOM file is uploaded from an upload terminal (6) to a server (2). A medical personnel accesses medical image data from a viewing terminal (8a) and plays the video image provided by the server. The user inputs a comment, into which link destination information to the medical image data is incorporated (inserted), via a comment input field on a medical image viewing screen.