In this paper,we propose an adaptiveQoS (Quality of Service) control mechanism and its corresponding architecture using multi-agent framework to improve flexibility of a videoconference system (FVCS). The proposed mechanism realizes more flexible by changing their QoS control strategies dynamically than a conventional videoconference system. We modelled the prototype of our modified FVCS and implemented the proposedmechanismby varyingQoS parameters.The prototype systemshows its capability of flexible problem solving against QoS degradation, along with other possible problems within the given time limitation.