To monitor the state of an information input output equipment, remotely while using the existing information input output equipment and the system environment without any modification by judging the state of a signal between a host computer and the information input output device.

The state monitor adapter 7 always monitors in formation sent through a signal line group 10 between a host computer 4 and a printer 5. Then a signal state discrimination circuit 11 intercepts a signal sent through the signal line group interconnected between connectors 8, 9 to estimate the state of the printer 5 and to provide the output of an operation instruction signal corresponding to the result to a drive control circuit 12. The drive control circuit 12 drivers a laser pointer of a remote notice means 13 to form the spot of a visual light laser beam being notice information on a ceiling.