Provided is a delivery control device, a data delivery system, and a delivery control method that enable a simultaneous data delivery to a number of reception terminals by increasing the number of reception terminals simultaneously connecting to a router. The delivery control device 100 includes an IP address-MAC address record unit 105 that associates an IP address with a plurality of MAC addresses and holds the IP address and the MAC addresses, and a transmission unit 101, 102 that specifies a destination MAC address to transmit a packet. The transmission unit 101, 102 transmits a packet addressed to a predetermined IP address to all the MAC addresses that have been associated with the IP address in the IP address-MAC address record unit 105.