A service server is started. An embodiment provides a first game reward to the learner's account based on learning activity information corresponding to the learner's game play information in the game, and sends a class invitation message received from the instructor's terminal to the learner's terminal By transmitting, a communication session is established between the instructor's terminal and the learner's terminal, and a second game reward is provided to the learner's account based on learning activity information in a class through the communication session.
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