A communication method for incorporating an IoT technique with a 5G communication
system for supporting a higher
data transmission rate in comparison with a 4G
system and subsequent systems and a
system therefor are disclosed. The present invention can be applied to intelligent services (for example, services related to smart homes, smart buildings, smart cities, smart cars or connected cars, health care,
digital education, retail business, security, and safety) on the basis of a 5G communication technique and IoT-related techniques. A method for transmitting and receiving a
signal in a terminal of a mobile communication system, according to one embodiment of the present specification, comprises the steps of establishing an access for a specific PDN connection with a
base station and a
wireless local area network (WLAN); detecting that the access through the WLAN is unusable; and transmitting, to a
mobility management entity (MME), a control message for moving traffic through the WLAN, through the
base station. According to one embodiment of the present specification, a traffic transmission path of the terminal capable of accessing both a 3GPP network and a non-3GPP network can be controlled in the network and the traffic transmission path can be determined according the states of the network and the terminal, thereby effectively utilizing limited communication resources.