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Please predict whether this patent is acceptable.PATENT ABSTRACT: A creativity support server extracts a node that is generated by a user from a tree diagram that is generated according to nodes each representing an opinion created by each user to derive a solution to a problem dealt with in a discussion and links each representing relevance between the nodes. The creativity support server classifies the extracted node according to dependency between the extracted node and other nodes included in the tree diagram. The creativity support server specifies a character of the user according to result of the classifying.