A transmission management system for controlling data transmission between a first transmitting terminal and a second transmitting terminal is provided. The transmission management system includes a receiving unit that receives location information about the second transmitting terminal; and a transmitting unit that transmits first presence information about the first transmitting terminal to the second transmitting terminal depending on first location information about the second transmitting terminal received by the receiving unit, and transmits second presence information about the first transmitting terminal to the second transmitting terminal depending on second location information about the second transmitting terminal received by the receiving unit.