Disclosed are a communication apparatus having a server function for making a storage device, which stores files, accessible over a network, and a method of controlling this apparatus. The apparatus and method set the server function, register an address, which is for transmitting a file to the storage device, in an address book, transfer a file to the storage device in accordance with the address that has been registered in the address book, and changes the address, which has been registered in the address book, in accordance with a change in the setting of the server function.