Ten representative images are extracted from an image database storing images of a number of frames. The extracted representative images are displayed in a coordinate area, along the coordinate axes of which the image characteristics of the images are plotted, in a form in which the images are distributed in accordance with the image characteristics possessed by the extracted representative images. An image having characteristics resembling those of a required image is designated from among the representative images displayed. Images of ten frames having characteristics resembling those of the designated image are again displayed in distributed form in a coordinate area having image characteristics plotted along the coordinate axes thereof. The coordinate axes of the coordinate area displayed the second time are made more detailed than those of the coordinate area displayed the first time. As a result, images having slightly different characteristics are displayed in separated form, thereby making it easier to find the required image.