SYSTEM AND METHOD FOR JUDGING VALIDITY OF COMMAND INPUTTED FROM USER TERMINAL

摘要

PURPOSE: A system and a method for judging validity of a command inputted from a user terminal are provided to simply determine the validity of the command inputted from the user based on rules and perform additional validity judgment in case that the validity of the command is not determined. CONSTITUTION: A permission database(803) includes permitted network address information and associated blocking keywords. A data extractor(8012) extracts the request contents or the network address information included in the command. The first judger(8013) judges that the extracted network address information is the permitted network address information. The second judger(8014) judges that the request contents are associated with the blocking keywords in the case of the permitted network address information. The third judger(8015) judges the command valid in the case that the request contents are not associated with the blocking keywords. In the case that the request contents are associated with the blocking keyword, the second judging system(1802) performs the validity of the command according to a selected judging method.