Patent ID: 7840578

Claim:
A computer-implemented click fraud detecting method of determining validity of a command, the method comprising the steps of: (a) receiving information request for receiving information from a webpage or for accessing the webpage associated with a search result of a search engine from a user terminal, the information request including a command associated with the webpage; (b) generating log information associated with the command, the log information including at least one of the search query included in the command, input time point information on a time point of inputting the command, and a network address of the user terminal; (c) recording the log information in a log database; (d) determining validity of the command for detecting information request with a malicious intent by using the log information previously recorded during a first time period according to a predetermined first determination; (e) recording identification information in the log information, the identification information being indicative of the validity information according to the first determination result; (f) searching for log information previously recorded during a second time period with reference to the log database; and (g) re-determining the validity of at least one of the determined command by using the searched log information according to a predetermined second determination, wherein the second time period is longer than the first time period, and the first determination result is one of valid, invalid, and suspected to be invalid and the step (d) comprises a step of determining that the command is the suspected to be invalid in case that the first determination result is within the error range statistically determined according to the first determination.