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WiBro is defined as a subset of the IEEE 802.16 standard and is developed based on the mobile WiMAX. WiBro delivers wireless data with a high transfer rate to provide mobile broadband services. However, it is necessary to consider radio resources efficiency due to limited resources. In this paper, we propose frequency assignment (FA) load balancing algorithm in order to use resources efficiently, by controlling two types of handover procedure and scheduling. When the resource unbalancing is detected in a FA, we choose BS (base station) initiated handover or MS (mobile station) initiated handover adaptively to disperse users entering and guarantee QoS (quality of service) in real time services. The difference between call admission control (CAC) and FA load balancing scheme is that FA load balancing scheme makes the MS connect with other FAs without disconnection. The proposed algorithm shows the performance improvement which is a lot for the existing algorithm in the user acceptance and QoS in real time service.