An IP address distribution system according to the present invention includes a network including a plurality of switches, and an IP address distribution apparatus connected to the network, in which each of the switches holds therein arrangement information that indicates a position thereof in the network, and when receiving an IP-address request signal from one of, devices connected thereto, adds the held arrangement information to the IP-address request signal and transfers the IP-address request signal, and when receiving an IP-address request signal, the IP address distribution apparatus selects an IP address from a range corresponding to the arrangement information added to the signal and distributes the selected IP address to a request source device.