On a report making screen, medical images taken from a patient are displayed in a viewer. When an area of concern, such as an abnormal shadow, is designated in any of the displayed medical images, the medical images containing the area of concern are chosen. By drag-and-dropping one of the chosen images to an assigned position in a comment editing zone of the report making screen, a three-dimensional image reconstituted of the chosen images is displayed as a confirmation image, wherein the designated area of concern is displayed distinguishably from other portion, enabling checking whether the choice of the images or the designation of the area of concern is correct or not. When the choice and designation is fixed, group data registering the chosen images as a group and position data relating to positions of the area of concern in the chosen images are memorized in linkage with the assigned position.