An embodiment of the disclosure provides a first power receiving device including a battery, a power management integrated circuit, an interface for receiving power from a power supply device, and a processor configured to control a charging current using the power management integrated circuit. The processor may be configured to: if charging from the power supply device through the interface is detected, set the charging current, transmit first charging information associated with the first power receiving device to the power supply device, through the interface, receive second charging information associated with a second power receiving device which is paired with the first power receiving device or associated with the power supply device from the power supply device, through the interface, and control the charging current by comparing the first charging information and the second charging information.