An apparatus of a terminal in a wireless communication, comprising: a radio frequency, RF, transceiver comprising one or more RF transceivers; and a main processor, comprising one or more processors operatively coupled to the RF transceiver, wherein the main processor is configured to: connect with a first wireless access point having a strongest received signal strength among wireless access points; transmit, through the first wireless access point, an internet key exchange, IKE, initialization request to be transmitted to an evolved data packet gateway, ePDG, server; identify whether the first wireless access point supports ePDG communication based on whether the first wireless access point provides an IKE initialization response corresponding to the transmitted IKE initialization request; and if the first wireless access point supports the ePDG communication, connect to the ePDG server through the first wireless access point; and if the first wireless access point does not support the ePDG communication, connect with a second wireless access point having a next strongest received signal strength among wireless access points, and transmit, through the second wireless access point, an IKE initialization request to be transmitted to the ePDG server. a radio frequency, RF, transceiver comprising one or more RF transceivers; and a main processor, comprising one or more processors operatively coupled to the RF transceiver, wherein the main processor is configured to: connect with a first wireless access point having a strongest received signal strength among wireless access points; transmit, through the first wireless access point, an internet key exchange, IKE, initialization request to be transmitted to an evolved data packet gateway, ePDG, server; identify whether the first wireless access point supports ePDG communication based on whether the first wireless access point provides an IKE initialization response corresponding to the transmitted IKE initialization request; and if the first wireless access point supports the ePDG communication, connect to the ePDG server through the first wireless access point; and if the first wireless access point does not support the ePDG communication, connect with a second wireless access point having a next strongest received signal strength among wireless access points, and transmit, through the second wireless access point, an IKE initialization request to be transmitted to the ePDG server. connect with a first wireless access point having a strongest received signal strength among wireless access points; transmit, through the first wireless access point, an internet key exchange, IKE, initialization request to be transmitted to an evolved data packet gateway, ePDG, server; identify whether the first wireless access point supports ePDG communication based on whether the first wireless access point provides an IKE initialization response corresponding to the transmitted IKE initialization request; and if the first wireless access point supports the ePDG communication, connect to the ePDG server through the first wireless access point; and if the first wireless access point does not support the ePDG communication, connect with a second wireless access point having a next strongest received signal strength among wireless access points, and transmit, through the second wireless access point, an IKE initialization request to be transmitted to the ePDG server.