An electronic device comprises a communication module, a display, a processor, and a memory, wherein the memory can control the communication module such that the processor performs a communication connection for screen sharing with an external electronic device, can acquire display information of the external electronic device from the external electronic device, can generate one or more pieces of transmission screen information on the basis of at least the display information of the electronic device or the display information of the external electronic device, and can determine the resolution or the screen ratio of the transmission screen information on the basis of at least the screen ratio of the external electronic device.