An NC program transfer apparatus includes: a determiner for determining whether or not a selected NC program is one that is generated for a selected wire electrical discharge machine; and a transfer unit which transfers the selected NC program to the selected wire electrical discharge machine when the selected NC program is one that is generated for the selected wire electrical discharge machine and prohibits the selected NC program from being transferred to the selected wire electrical discharge machine when the NC program is not the one that is generated for the selected wire electrical discharge machine.