Provided is an information providing system for a system administrator not highly skilled in the arts of natural language or artificial intelligence to be able to easily correct or add a response to an input from a user to arrange the response into an appropriate one if the response is not appropriate. When an input sentence does not hit any knowledge data, the system administrator is able to add a combination of the input sentence and a response thereto by opening a new QA quick addition screen from a knowledge maintenance screen by pressing a link of the input sentence. Furthermore, the system administrator is able to easily add the input sentence to knowledge data as a synonymous sentence of a candidate Q, which is determined to be semantically close to the input sentence, by clicking the candidate Q on the knowledge maintenance screen.