PROBLEM TO BE SOLVED: To provide a system for judging an action capable of appropriately judging whether a player or the like has made a flying start.;SOLUTION: Each microwave transmission/reception device 11 detects the move (action) of the player changing from a stationary state to a moving state by the Doppler effect. A trigger device 14 discharges a start signal synchronizing with the gun. The device 16 for judging the flying start judges whether the player acts within a previously determined, stillness maintaining time (e.g., a specified time before and after a start) according to the relationship between a timing in which each device 11 detects the action of each player and a timing in which the start signal is discharged.;COPYRIGHT: (C)2005,JPO&NCIPI
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