METHOD FOR TRANSFERRING MULTI-CAST PACKET, ENTRANCE NODE AND ROUTER TO REALIZE SUCH METHOD AND INTERNET NETWORK INCLUDING SUCH ENTRANCE NODE AND SUCH ROUTER

PROBLEM TO BE SOLVED: To shorten reconstruction processing time of a packet header by determining a subset of a preliminarily defined destination when a multi-cast packet including a value of receiver update notification is received, determining the next hop of a set of the next hop and including the subset of the preliminarily defined destination and a value of an updated number of a receiver in the multi-cast packet. SOLUTION: A required construction set CS1 is determined by a unique method by unique connection between a value of the update number RUN-1 of the receiver and an Internet address of the entrance node N1. Furthermore, the determined construction set CS1 is preliminarily constituted and immediately used. Retrieval of a uni-cast routing table is not required for transferring the Internet packet P. A new header is immediately recompiled. The subset of the destination is determined according to destination relation of a memory MEM and this information is transferred to a router inclusion means R-INC by a destination determining means DET-DES.