A transmission control system capable of transmitting data received from a first transmission terminal to a second transmission terminal, includes a receiver unit to receive identification information to identify the second transmission terminal or a user of the second transmission terminal, the data, and first type information that represents a type of the data, from the first transmission terminal; and a transmission control unit to control the received data not to be transmitted to the second transmission terminal in a case where the received first type information is not included in second type information corresponding to the received identification information, the second type information being managed in a management unit configured to have identification information to identify a predetermined transmission terminal or a user of the transmission terminal, associated with the second type information that represents a type of data processible by the predetermined transmission terminal.