Method and apparatus for preventing confidential information leak

A method and an apparatus for preventing confidential documents from leaking are provided to make it possible to construct a selective monitoring system which allows a user to check content of data, and to perform a monitoring or a real time intercepting for unregistered confidential documents which were not monitored in the conventional. An apparatus for preventing confidential documents from leaking comprises a document collector(115), a controller(113), a monitoring & intercepting unit(112), a storage unit(114) and an input/output unit(I/O)(111). The document collector collects documents from all the supporting monitoring ends. The controller learns knowledge on confidential documents for recognizing whether a document is confidential with respect to all the collected documents, and determines whether the document is confidential on the basis of a secret detection algorithm in accordance with the learned knowledge on the confidential documents. The monitoring & intercepting unit monitors whether documents leak at all the monitoring ends and intercepts the confidential documents determined by the controller. The storage unit stores information on a model generated according as the knowledge on the collected secret documents is learned. The input/output unit transmits and receives all kinds of information related to the prevention of reveal of confidential documents.