Method for controlling application related to third party server in wireless communication system and device for same

An embodiment of the present invention relates to a method for controlling an application related to a third party server by a network node in a wireless communication system. The application control method comprises the steps of: receiving a Control of Applications when Third Party Servers encounter difficulties (CATS)-related policy from a gateway; and transmitting the CATS-related policy to a terminal, wherein the network node stores the CATS-related policy when the terminal is in an idle mode.