The present invention provides a site evaluation system for evaluating a site which consists of one or more pages and a site evaluation program storage medium that stores thereon a site evaluation program for causing a computer system to operate as such a site evaluation system, in which site evaluation that minimizes errors and inconsistency and requires a lower evaluation cost can be performed. The system acquires a temporal change in the numbers of accesses to each of pages constituting a site, identifies a page for which a temporal change in the number of accesses exceeds a predetermined criterion, further acquires a temporal change in a word in the identified page, compares the temporal change in the number of accesses to the identified page with the temporal change of the word, and evaluates the comparison result based on a predetermined criterion.