The invention claimed is:1. An electronic device comprising:a display;a first communication circuit configured to perform communication through a first communication network;a second communication circuit configured to perform communication through a second communication network;a memory; anda processor electrically connected to the memory,wherein the memory stores instructions causing the processor to, when executed, receive a preference for preventing communication network switching on a predetermined application, and deactivate the second communication circuit while the predetermined application with the preference for preventing communication network switching is executed using the first communication circuit, in a state in which both the first communication circuit and the second communication circuit, having a higher priority than the first communication circuit, are activated, andwherein, when the predetermined application is executed using the first communication circuit, the processor performs control to display information indicating a limit of a second communication network connection through the second communication circuit on the display and, when the execution of the predetermined application ends, performs control to display information indicating release of the limit of the second communication network connection on the display.2. The electronic device of claim 1, wherein the first communication network is a mobile communication network which is one of 2nd Generation (G), 3G, 4G, and Long-Term Evolution (LTE), and the second communication network is a Wi-Fi network.3. The electronic device of claim 1, wherein, when the execution of the predetermined application ends, the processor performs control to activate the second communication circuit.4. The electronic device of claim 1, wherein the predetermined application is an application required to transmit or receive data in real time to or from an external server, and comprises at least one of a real-time video provision application and a game application.5. The electronic device of claim 1, wherein, when the predetermined application is executed using the first communication circuit, the processor performs control to deactivate the second communication circuit according to attribute information of the predetermined application.6. The electronic device of claim 5, wherein the attribute information of the predetermined application comprises at least one of application identification information, an application type, and information on an amount of used data.7. The electronic device of claim 1, wherein the memory stores a plurality of applications and the processor stores, in the memory, mapping information for setting whether to limit communication network switching for each of the plurality of applications in response to a user input.8. The electronic device of claim 7, wherein the processor determines whether the predetermined application is an application set to limit the communication network switching, based on the mapping information stored in the memory, and when the predetermined application corresponds to the application set to limit the communication network switching, performs control to deactivate the second communication circuit while the predetermined application is executed using the first communication circuit.9. A method of controlling a communication network connection by an electronic device, the method comprising:receiving a preference for preventing communication network switching on a predetermined application;executing the predetermined application with the preference for preventing communication network switching using a first communication circuit in a state in which both the first communication circuit for performing communication through a first communication network and a second communication circuit having a higher priority than the first communication circuit are activated;performing control to deactivate the second communication circuit while the predetermined application is executed;in response to the predetermined application being executed using the first communication circuit, displaying information indicating a limit of a second communication network connection through the second communication circuit on a display of the electronic device; andin response to termination of the execution of the predetermined application, displaying information indicating release of the limit of the second communication network connection on the display.10. The method of claim 9, wherein the first communication network is a mobile communication network which is one of 2nd Generation (G), 3G, 4G, and Long-Term Evolution (LTE), and the second communication network is a Wi-Fi network.11. The method of claim 9, further comprising, when the execution of the predetermined application ends, performing control to activate the second communication circuit.12. The method of claim 9, wherein the predetermined application is an application required to transmit or receive data in real time to or from an external server, and comprises at least one of a real-time video provision application and a game application.13. The method of claim 9, further comprising, when the predetermined application is executed using the first communication circuit:determining attribute information of the predetermined application; andperforming control to deactivate the second communication circuit according to the attribute information of the predetermined application.14. The method of claim 13, wherein the attribute information of the predetermined application comprises at least one of application identification information, an application type, and information on an amount of used data.