A communication management system comprises a first rule database storing a rule for extracting specific communication data among communication data; a search unit searching the first rule database to check if the communication data complies with a rule stored therein; an output unit which, when the communication data complies with the rule stored in the first rule database, outputs the communication data; an update unit accepting a change in a rule and updating it; a second rule database storing the updated rule changed by the update unit; and a database server transmitting the updated rule from the second rule database to the first rule database, and reflects in real time, the change in a rule.