NATURAL LANGUAGE PROCESSING SYSTEM

A natural language arrangement includes stored grammatical rules each having a phrase structure part representing grammatical functions, a semantic part representing the manner of propagation from a superordinate category to a subordinate category, a condition part, and a message part that imposes limitations on a phrase structure rule using the subordinate category as a superordinate category. The grammatical rules are searched and interpreted to generate a phrase structure for a sentence from grammatical function information obtained by interpreting and applying the searched grammatical rules.