PURPOSE:To improve the monitoring condition of every game machine with economical installation cost by setting a monitoring video camera to a set state for monitoring the game machine judged to be in an abnormal state from the analysis of information by an abnormality detecting means and indicating image information on a screen. CONSTITUTION:A hall control computer 20 analyzes various information normally inputted from various sensors of abnormality detecting means to judge the abnormal state of a game machine 1. When a CPU 40 receives the stand number of the game machine 1 judged to be in the abnormal state, it controls respective drive units 11a-11d through a controller 30 of a monitoring video camera 10 registered as the best monitor for the game machine 1 to set the horizontal, vertical, zooming and focusing positions to the set monitored state of the game machine 1 stored previously in the set monitored state memories 32a-32d. Images of the game machine 1 under the abnormal state and a player are projected magnified on a display section 50 to be easily observed.
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