A communication system comprising: a reception apparatus; a transmission apparatus configured to perform streaming to the reception apparatus; and a control apparatus configured to manage a state of a network that connects the reception apparatus and the transmission apparatus and includes a first communication line and a second communication line, wherein the first communication line is unstable in connection state as compared with the second communication line, and the control apparatus is configured to manage a state of the network on a basis of a packet transmitted from the transmission apparatus to the reception apparatus, wherein the first communication line has large delay or packet loss as compared with the second communication line, wherein the first communication line includes a wireless communication line, and the second communication line includes only a wired communication line, wherein the transmission apparatus is connected to the network by the first communication line, and the reception apparatus is connected to the network by the second communication line, wherein the transmission apparatus is configured to perform the streaming by a user datagram protocol, UDP, to the reception apparatus, wherein the control apparatus includes: a state grasping unit configured to grasp a reception state of the streaming in the reception apparatus through a transmission control protocol, TCP, connection; and a designation unit configured to designate to stop the streaming on a basis of the reception state of the streaming. a reception apparatus; a transmission apparatus configured to perform streaming to the reception apparatus; and a control apparatus configured to manage a state of a network that connects the reception apparatus and the transmission apparatus and includes a first communication line and a second communication line, wherein the first communication line is unstable in connection state as compared with the second communication line, and the control apparatus is configured to manage a state of the network on a basis of a packet transmitted from the transmission apparatus to the reception apparatus, wherein the first communication line has large delay or packet loss as compared with the second communication line, wherein the first communication line includes a wireless communication line, and the second communication line includes only a wired communication line, wherein the transmission apparatus is connected to the network by the first communication line, and the reception apparatus is connected to the network by the second communication line, wherein the transmission apparatus is configured to perform the streaming by a user datagram protocol, UDP, to the reception apparatus, wherein the control apparatus includes: a state grasping unit configured to grasp a reception state of the streaming in the reception apparatus through a transmission control protocol, TCP, connection; and a designation unit configured to designate to stop the streaming on a basis of the reception state of the streaming. a state grasping unit configured to grasp a reception state of the streaming in the reception apparatus through a transmission control protocol, TCP, connection; and a designation unit configured to designate to stop the streaming on a basis of the reception state of the streaming.