Shaping device and router device

A shaping unit includes FIFOs for accumulating a packet which is so designed as to arrive at a destination address. A packet (an ordinary packet), which has one destination address, is accumulated into the FIFO corresponding to the one destination address. A packet (a virtual multicast packet), which will be copied in the downstream of the shaping unit to arrive at two destination addresses, is accumulated into either of the FIFOs. A packet read unit transmits the virtual multicast packet, which is read from either of the FIFOs, and the ordinary packet, which is read from the one of the FIFOs, to a multiplexing circuit in such a manner that the total bandwidth of both packets is controlled.