When an IFAX processing section transmits image information using e-mail, a timer monitoring section starts the count of a timer. After starting the count, a received mail determining section determines whether or not a timeout occurs. Also, the received mail determining section determined whether an error mail of a current job or a DSN of the current job is received. In the case of the timeout, when the notification content of the error mail or the DSN is an abnormal end, a transmission selecting section instructs a FAX control section to transmit an image information file of the current job to a telephone number. Thereafter, the transmission selecting section instructs an image information managing section to erase an image information file corresponding to a file name of the current job. This makes it possible to insure a real-time property as making use of advantages of e-mail.