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A message 6 received or created in a message generating section 10 is stored in a message memory 3. Upon lapse of a stand-by time, a message processing section 15 reads out the message 6 from the message memory 3 for transmission to an external device or for an internal process. When the transmission or the internal process of the message 6 is completed, an ID code attaching section 18 attaches a code indicating that the processing has been completed to the message 6. A database stored in a discrimination database memory 4 describes an effective term with respect to each of contents of the message 6. In response to receiving a restart signal 8 after the operation of an apparatus controlling device 100 is suspended, a message discriminating section 20 causes the message processing section 15 to process the message which has not been processed and whose effective term has not lapsed, among the message(s) 6 stored in the message memory 3. With this arrangement, the message which has been left unprocessed by the