Patent ID: 8204188

Claim:
A fax server comprising: a transmission/reception module transmitting and receiving first fax data to and from an external source via an Internet; a storage module storing the first fax data from the transmission/reception module; a filtering module receiving the first fax data from the storage module and outputting one of a reception refusal signal and a reception approval signal both for the first fax data to the storage module on the basis of a caller number included in the first fax data; an authentication module receiving second fax data from a second user computer to be output to the outside and transmitting the second fax data to the computer of an approver and the storage module in order to authenticate the content of the received second fax data; wherein the storage module has received the reception approval signal for the first fax data, the storage module transmits the first fax data received via the transmission/reception module to the second user computer in response to a fax request signal output from the second user computer; the authentication module may be configured to receive an authentication signal from the approver via the approver's computer and transmits the authentication signal to the storage module; the filtering module may be configured to receive the second fax data from the storage module and outputs one of a send refusal signal and a send approval signal both for the second fax data to the storage module on the basis of a destination number included in the received second fax data; and when the storage module has received the authentication signal and the send approval signal both for the second fax data, the storage module transmits the stored second fax data to the outside via the internet.