Various embodiments of the present disclosure relate to a method and apparatus for connecting to multiple Packet Data Networks (PDNs) in a wireless communication system using a Carrier Aggregation (CA) technique. In the wireless communication system using the CA technique for aggregating multiple carriers into one carrier, the wireless communication system may ensure Quality of Service (QoS) of a subscriber by mapping multiple carriers and multiple PDNs on the basis of a dynamic CA carrier. Various embodiments are possible.