A method and system for managing facsimile (fax) data in an integrated manner are provided. The system includes an integrated fax server, and a fax terminal configured to transmit and receive fax data via a first communication network and to transmit the transmitted fax data and the received fax data to the integrated fax server via a second communication network. The integrated fax server storesfax data received from the fax terminal in a database. The integrated fax server also simultaneously stores fax data, which will be transmitted at a user's request, in the database and transmits the fax data to the fax terminal. The fax terminal includes a fax machine connector configured to receive transmit fax data from a fax machine, a first communication network connector configured to transmit and receive fax data via a first communication network, and a server interface unit configured to transmit fax data to the integrated fax server. Accordingly, transmitted and received fax documents, which are difficult to be managed due to spatial restriction, are managed using the integrated fax server in the integrated manner, so that the utility of the fax documents and the efficiency of secured document management can be increased.