PURPOSE: To distinguish sound output from alarm output surely by providing in an electronic computer additionally a judging means for evading the overlapping of the sound output and the alarm output.

CONSTITUTION: Supervisory information is latched into an electronic computer 3 from a remote monitor and control equipment 2 via a transmission route 8. The supervisory information is latched into a signal controlling means 4, and converted into an output signal. A judging means 9 controls output request to a sound outputting device 6 and an alarm outputting device 7, so that a sound output request signal and an alarm output request signal may not be requested overlapping each other from the output signal and the supervisory information received via a cue for example, and reports it to an operator. Namely, it is judged whether a sound or alarm is being outputted, and if it is being outputted output request is kept delyaed not to be made until the output stops. Consequently, it becomes possible to distinguish sound output from alarm output securely.