4. The storage medium of claim 1 , wherein the instructions for extracting at least one expression include instructions for extracting an expression that represents at least one indirect speech event.
4. The storage medium of claim 1 , wherein the instructions for extracting at least one expression include instructions for extracting an expression that represents at least one indirect speech event. 5. The storage medium of claim 4 , wherein the indirect speech event represents an embedded speech event, in which a speaker conveys information, and represents a dominating speech event, in which an author reports on the embedded speech event, and expresses sentiment toward the information or toward the speaker.