Provided is an apparatus to detect congestion of a network using a receiver of a communication system. The apparatus includes a transport layer information extraction unit configured to extract transmission control protocol frame information from information that is received from a lower layer. The apparatus also includes a congestion information filtering unit configured to identify and output a packet to determine congestion in the transmission control protocol frame information. The apparatus further includes a congestion detection unit configured to determine whether the network is congested using the packet to determine congestion. The apparatus includes a congestion information output unit configured to, upon detecting congestion in the network, deliver information indicating the detection of the congestion in the network to an operating system or other applications.