Wireless local area network (WLAN) uses carrier sens multiple access with collision avoidance (CSMA/CA) to share wireless medium. However, in dense WLAN environment, it occurs interference between WLAN nodes such as access points (APs) and stations (STAs). For resolving this problem, we propose management of WLAN APs by using open network operating system (ONOS) controller which is one of software defined network (SDN) controller. Based on this, we propose a channel and transmission power control of WLAN AP in order to optimize the channel. Experimental results shows that our proposed scheme can improve performance of WLAN in terms of data rate.