A method and device for synchronizing a contents file are discussed. An embodiment is directed to a method for synchronizing data using a target device, the target device including a target contents file, the method comprising: receiving file information of a reference contents file from a reference device; comparing the file information of the reference contents file and file information of the target contents file to determine whether a contents file synchronization is needed; and synchronizing the target contents file using the reference contents file based on the comparison result.