1. An authoring apparatus comprising: a display section that displays a matrix plane on which a time axis and an axis of applicable levels corresponding to a predetermined keyword cross each other; and a GUI processing section that displays identifiers indicating scenes obtained by dividing a moving image file into predetermined segments arranged on said matrix plane and decides, when the positions of said identifiers arranged on said matrix plane are moved, said applicable levels corresponding to the positions of said moved identifiers as said applicable levels of said scene corresponding to said identifiers.