The present invention registers a plurality of user terminals 300, a central server 100 that generates group information from the registered plurality of user terminals 300, receives broadcast content by voice or text, and generates broadcast information. , A manager terminal 200 that transmits the broadcast information to a user terminal 300 belonging to a group created by the central server 100, and a plurality of users who can check the broadcast information transmitted from the manager terminal 200 It characterized in that it is configured to include a terminal (300).
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