For appropriate communication control to improve throughput in TCP communication, a communication apparatus comprises: a communication unit configured to establish a TCP connection with an external communication apparatus and communicate with the external communication apparatus; a reception unit configured to receive device information including first information for specifying a hardware configuration of the external communication apparatus or second information for specifying a software configuration of the external communication apparatus, if the communication unit establishes the TCP connection with the external communication apparatus; and a control unit configured to perform control to change a re-transmission timeout (RTO) timer value of the TCP connection based on the received device information.