A usability analysis method of a web application including: a first step of acquiring a page transition log and operation logs on individual pages in the web application; a second step of detecting a segment having a specific page transition pattern in the page transition log; a third step of managing operation logs on individual pages included in the detected page transition pattern in relation to the individual pages; a fourth step of performing statistic processing on the managed operation logs and analyzing page utilization; and a fifth step of analyzing usability based on the page transition pattern and the page utilization.