A method and system is provided for editing a file information system of a host device by using a client device connected to the host device via a Near Field Communication (NFC) channel while maintaining the foreground-running application execution screen of the host device. A method for managing a file information system of a host device by using a client device according to the present invention includes establishing a near field communication channel between the client device and the host device; copying the file information system from the host device to the client device; editing, at the client device, the file information system by means of an application selected in the file information system; and updating the file information system stored in the host device with the edited file information system which is transmitted from the client device to the host device.