What do you mean a "cisco management unit"? Do you mean a Wireless LAN Controller?
If you want to change the IP Address of the APs, you first have to find out if the AP's IP Address is static or dynamic. If dynamic, you can get this done by editing the subnet on the DHCP server.
If static ... hoooo boy. This will depend on the IOS the WLC is running on. If it's earlier than 6.0.182.0 than you'll have to use CLI. If it's 5.2.157.0 then you have no choice because there's a bug.
Hope this helps.