An electronic device managing method and system, and a host electronic device using the method are disclosed. A plurality of client electronic devices may be connected to the host electronic device. The host electronic device may perform file storage state management, remaining battery capacity management, and file reproduction management, thereby integrally and efficiently managing the plurality of client electronic devices. The file storage state management may include managing file storage states corresponding to the memories of the plurality of client electronic devices, respectively. The remaining battery capacity management may include managing the remaining capacity of the batteries of the plurality of client electronic devices. The file reproduction management may include reproducing at least one of the files stored in the plurality of client electronic devices.