Method and apparatus for monitoring improper clicks

A method and a device for monitoring illegal clicks are provided to monitor the illegal click efficiently by discriminating the click having a purchase intention from various kinds of user actions based on tracking information for the user actions. A CTS(Conversion Tracking System) information collector(20) collects tracking information for action of a user in an advertiser website after a user moves to the website by clicking search AD(ADvertisement). A user action pattern analyzer(22) analyzes an average action pattern of the user based on the collected CTS information. An illegal click determiner(24) determines the action performed in the advertiser website as illegal click when the action performed in the advertiser website is out of a reference value from the average action pattern. An illegal click monitoring server is connected to a billing server. The billing server excludes the action from billing when the action performed in the advertiser website by the user is determined as the illegal click when the user moves to the advertiser website after clicking the search AD. The CTS information collector collects a login flag, a previous visit URL(Uniform Resource Locator), a user ID, a window ID, a window event, the visit URL, and/or a menu click date/time.