An image forming apparatus stores the received FAX data as a document in a storage unit. The information processing apparatus receives a FAX reception notification which is a notification indicating the reception of FAX data from the image forming apparatus and includes at least a telephone number of a transmission source of the FAX data. Then, the image forming apparatus determines whether or not a new arrival document is present in the storage unit, and sets the telephone number included the FAX reception notification as a property of the new arrival document when the image forming apparatus determines that the new arrival document is present in the storage unit.