Provided is an IP network-based headend system. The headend system may obtain service flow information pre-registered in a subscriber modem device, may transmit, to a service supply server connected based on an IP network, the pre-registered service flow information and the network protocol packet, may determine a data reception route determined by the service supply server, may receive, from the service supply server, a video data stream to perform data processing, may receive data processed video data stream, and may transmit the data processed video data stream to the subscriber modem device based on the pre-registered service flow information.