Accordingly the embodiments herein provide a method for dynamically controlling a TCP congestion window. The method includes estimating, by an electronic device 100, a real time available bandwidth for an available network. Further, the method includes deriving, by the electronic device 100, a dynamic congestion window control factor from the estimated real time available bandwidth. Further, the method includes modifying, by the electronic device 100, the congestion window based on the derived dynamic congestion window control factor. In an embodiment, the congestion window is modified by passing the real time available bandwidth information from a lower layer of a modem to a higher layer of a TCP Stack and adjusting the congestion window.