12. A method of presenting presentation support data, comprising the steps of: a) inputting content data about an object to be presented and data indicating an intention of presentation; b) analyzing the presentation intention to infer a causal relationship between events indicated by the content data of the object to be presented, thereby analyzing the object environment of the presentation; c) storing an object for supplementarily explaining the object environment of presentation by using the object environment to be supplementarily explained as an index; d) selectively obtaining an object having the object environment of presentation as an index; and e) displaying, when the content data about the object to be presented is to be displayed in the form of a graph, the object in combination with the graph.
13. A method according to claim 12, further comprising the step of: providing the object for supplementarily explaining the object environment of presentation as an image or a sound.