A communication system for one or more communication apparatuses communicable with an external apparatus includes a storing unit to store data received by a communication apparatus from the external apparatus used as a transmission sender of the received data, and transmission/reception information including information of the external apparatus as transmission sender information and identification information of the communication apparatus used for receiving the received data; an identification unit to identify received data, selected by a user, from the received data stored in the storing unit; a transmission data obtaining unit to obtain transmission data to be transmitted to the external apparatus; and a transmission control unit to transmit the transmission data to the external apparatus from the communication apparatus that has received the selected received data among the one or more communication apparatuses based on the transmission/reception information stored in the storing unit.