METHOD FOR PROVIDING CAPTCHA

摘要

PURPOSE: A CAPTCHA(Completely Automated Public Turing Test To Tell Computers and Humans Aparts) providing method is provided to enable real person to conveniently solve the CAPTCHA problem and not enable an automated program to easily solve the CAPTCHA problem, thereby improving the security about web server. CONSTITUTION: A providing type is selected among a first CAPTCHA type, a second CAPTCHA type, and a third CAPTCHA type(S1). A search word is elected from user information received from a web server or service information providing the web server(S2). Candidate CAPTCHAs including the search word in advertisement information are elected(S3). The providing CAPTCHA for using the CAPTCHA problem is selected(S4). The providing problem from candidate about advertisement problems included in the providing CAPTCHA is selected(S5).