A Voice over Internet Protocol, VoIP, communication control method comprising: Voice Over Internet Protocol (VoIP) setting a critical threshold value of the number of connections of VoIP communication through an access point apparatus by a wireless LAN; recording identification information of terminals each of which has transmitted a request for connection of VoIP communication; transmitting a packet indicating release an association from the access point apparatus to a terminal whose identification information is newly recorded after the number of terminals whose identification information have been recorded reaches the critical threshold value, and further characterized by: recording status information indicating during a call in association with the identification information to be recorded; changing the status information indicating during a call to status information indicating the call finished when a request for disconnection from VoIP communication is transmitted from the terminal whose status information indicating during a call has been recorded; changing the status information indicating the call finished to status information indicating during a call when a request for connection of VoIP communication is transmitted from the terminal whose status information indicating call finished has been recorded; and transmitting a packet indicating release an association to a terminal whose status information indicating during a call is newlyrecorded and the terminal whose status information indicating a call finished, when the number of terminals whose status information indicating during a call have been recorded reaches the critical threshold value. Voice Over Internet Protocol (VoIP) setting a critical threshold value of the number of connections of VoIP communication through an access point apparatus by a wireless LAN; recording identification information of terminals each of which has transmitted a request for connection of VoIP communication; transmitting a packet indicating release an association from the access point apparatus to a terminal whose identification information is newly recorded after the number of terminals whose identification information have been recorded reaches the critical threshold value, and further characterized by: recording status information indicating during a call in association with the identification information to be recorded; changing the status information indicating during a call to status information indicating the call finished when a request for disconnection from VoIP communication is transmitted from the terminal whose status information indicating during a call has been recorded; changing the status information indicating the call finished to status information indicating during a call when a request for connection of VoIP communication is transmitted from the terminal whose status information indicating call finished has been recorded; and transmitting a packet indicating release an association to a terminal whose status information indicating during a call is newlyrecorded and the terminal whose status information indicating a call finished, when the number of terminals whose status information indicating during a call have been recorded reaches the critical threshold value. recording status information indicating during a call in association with the identification information to be recorded; changing the status information indicating during a call to status information indicating the call finished when a request for disconnection from VoIP communication is transmitted from the terminal whose status information indicating during a call has been recorded; changing the status information indicating the call finished to status information indicating during a call when a request for connection of VoIP communication is transmitted from the terminal whose status information indicating call finished has been recorded; and transmitting a packet indicating release an association to a terminal whose status information indicating during a call is newlyrecorded and the terminal whose status information indicating a call finished, when the number of terminals whose status information indicating during a call have been recorded reaches the critical threshold value.