Multicast based content downloading method and its system for efficient network transmission

摘要

The present invention relates to an apparatus and method for transmitting a large amount of content having the same contents to a large number of users in a short time with respect to a large amount of moving pictures and the like by using an adaptive multicast method in consideration of a user's network environment, And more particularly, to a multicast-based content transmission system and method adaptable to a user network environment capable of reliably transmitting content while efficiently utilizing a network by transmitting content. A multicast-based content delivery system adaptable to a user network environment according to the present invention divides content to be transmitted to a user terminal into packet units and generates FEC packets by forward error correction (FEC) A content providing device for multicasting each of N × M content streams including FEC packets with M case contents having different data rates including N case contents to each user terminal; And a multicast stream list that can be accessed from the content providing apparatus and a transmission rate, measures the current network speed together with the content providing apparatus, and transmits the multicast stream list of the multi- And a user terminal that determines a multicast stream to be connected to the content providing apparatus and receives content from the content providing apparatus in the determined multicast stream.