In FIG. 12, events E8-2 and E8-4 are derived from event class C8-1, and succeed objects, relations, and the like in this event class C8-1.<Other Examples of Meta Data Appending Process>Other examples of the meta data appending process explained with reference to FIG. 6 will be described.<Meta Data Appending Process (Part 2)>In the above embodiment, after information such as a moving image or the l