INFORMATION PROVIDING SYSTEM, INFORMATION PROVIDING METHOD, AND DATA STRUCTURE OF KNOWLEDGE DATA

The present invention makes it possible for information acquisition of knowledge data desired by a user to be performed easily. An information providing system 1: stores question character strings to which response contents are associated; stores a synonym dictionary in which synonyms comprising a plurality of terms defined as having mutually similar meanings are set; receives an input character string input from a user terminal 100 operated by a user; converts terms included in the input character string on the basis of the synonym dictionary to obtain a search character string; identifies the question character string relating to the search character string; and transmits the identified question character string to the user terminal 100.