A method for managing files is provided. The method includes steps of: a file managing device (a) detecting a system call corresponding to a file access request from a program executed by the device; and (b) performing, by referring to the detected system call and parameters thereof, at least one of (i) execution of a procedure corresponding to the system call and (ii) supporting execution of the procedure corresponding to the system call, based on at least one file management policy; wherein the policy includes a local file naming policy to determine at least one of a file name and a file path among the parameters, by referring to an attribute thereof, which has at least part of a creation date and time, a modification date and time, a type, a name, an owner, a creator, an access privilege, origin information, version, situational information, a keyword and a subtitle.