To provide a communication path control apparatus capable of properly switching to a communication path via a different wireless IP network while coping with sudden degradation in communication quality in transmitting a voice IP packet via a wireless IP network and to provide the relating wireless communication apparatus, communication path control method and communication method for the wireless communication apparatus as well.

A switching server 100 relays a VoIP packet transmitted toward an IP telephone terminal 42 from a cellular phone terminal 300A and obtains in sequence the receiving time of the VoIP packet received from the cellular phone terminal 300A. Furthermore, the switching server 100 switches a communication path R1 via a wireless IP network 10A to a communication path R2 via a wireless IP network 10B, based on a plurality of receiving times obtained.