1. A communication support system for supporting communication between users using natural languages, the system comprising: a syntactic analysis section for performing syntactic analysis processing to a natural language sentence received from a first user to extract word information, case information, and attribute information of the sentence; an illustration dictionary retention section for retaining word information, case information, and attribute information and illustrations corresponding thereto; and an illustration representation presentation section for presenting to a second user an illustration representation of the syntactic analysis result received from the syntactic analysis section by referring to the illustration dictionary retention section.