To provide a method for allocating a computer address to the equipment of industrial facilities connected to a local communication architecture and using IP, TCP and UDP protocols.

This method is provided with a step for equipment to perform the multi-address communication of a request frame containing a UDP port address peculiar to the equipment, UDP port address of address allocated equipment and address request, a step for considering a request when the allocation equipment recognizes its own port address, a step for the allocation equipment to perform the multi-address communication of a frame containing its own IP address and the UDP port address of request equipment, a step for considering the IP address of the allocation equipment the request equipment recognizes its own port address, and a step for the request equipment to determined the IP address by using its own hardware address in place of the hardware address of allocation equipment in that IP address.