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In networked real-time games such as First Person Shooting (FPS) through a network which does not guarantee the Quality of Service (QoS), the consistency and fairness among players may be disturbed owing to network delay and jitter. To keep the consistency and fairness high, this paper carries out group synchronization control, which adjusts the output timing among multiple terminals. However, the interactivity slightly deteriorates under the control. By the Quality of Experience (QoE) assessment for FPS, this paper investigates the influences of network delay and a parameter of the group synchronization control on the interactivity and fairness.