An electronic device is provided which includes a housing having a hole, a tray that receives a subscriber identification module (SIM) card and a secure digital (SD) card, a first socket, a communication circuit, a processor, and a battery that supplies power to the communication circuit, the processor, the SIM card, and the SD card, wherein the processor is configured to detect extraction of the tray from the first socket, interrupt power supply to the SIM card and the SD card through the first socket in response to extraction of the tray, detect insertion of the tray into the first socket, determine a priority of the SD card and the SIM card when both the SIM card and the SD card are detected in the inserted tray, and reset a task block that processes the SIM card, if the SIM card has a higher priority than the SD card.