When a user of a PC of a setting management system designates an IP address that should be deleted from IP addresses that have been set for a management target device, the PC presumes that another parameter should be changed together with the designated IP address based on a setting function that was used for setting the IP address. Also, the PC informs the user about the existence of such a parameter by displaying a message on a display unit that another parameter closely related to the IP address (designated by the user to be changed) should also be changed in conjunction with the IP address.