An information providing system comprises: an associated document determining unit that determines at least one piece of associated document data that includes an expression equal or similar to a cited section based on a cited section in document data; a limiting expression extraction unit that extracts an expression that corresponds to a condition for, correction for, addition to, or annotation to an expression equal or similar to the cited section from associated document data determined by the associated document determining unit; an information creation unit that creates an expression extracted by the limiting expression extraction unit or information regarding this expression as information to be displayed; and a display unit that displays information created by the information creation unit.