According to an embodiment, an electronic device includes a first antenna configured to perform first communication using a first frequency band and second communication using a second frequency band in a first mode and a second mode, a second antenna configured to perform the first communication and the second communication in the second mode, a communication module configured to perform communication using the first antenna in the first mode and using the first antenna and the second antenna in the second mode, a first switch module, and at least one processor configured to, where the first communication is performed in the first mode, connect the second antenna with the communication module using the first switch module, and where the second communication is performed in the first mode, disconnect the second antenna from the communication module using the first switch module. Other embodiments are also disclosed.