Provided are a legal information processing system, method, and non-transitory computer-readable storage medium storing program which enable the acquisition of useful information anticipating trends in the revision of legislation, regulations, or standards. This legal information processing system sets one or more key persons who are involved in legislation, regulations, or standards, collects at least public information which is created by the key person or in the publication of which the key person is involved, and predicts a trend in the revision of legislation, regulations, standards on the basis of the content of the collected information.