Electronic device and method of electronic device operating file system

An electronic device comprising:

• a storage;
• a memory;
• and
• a processor electrically connected to the memory and configured to read or write a file from or to the memory,
• wherein the memory comprises:
• a lower file system configured to compress and store at least one file by using a first partition of the storage;
• an upper file system configured to compress and store at least one file by using at least one of a second partition of the storage or the lower file system;
• and
• a stackable file system configured to, based on a request from an application layer, provide a requested file by using at least one of the lower file system or the upper file system, and
• wherein the processor is configured to:
• obtain a number of times in which the stackable file system accesses a corresponding file of the at least one file in the lower file system based on a request from the application layer with respect to the corresponding file;
• copy, to the upper file system, a first file having an access number greater than a certain level by decompressing the first file in the lower file system;
• and
• control the stackable file system to read the first file from the upper file system and provide the first file to the application layer based on a request from the application layer being detected with respect to the copied first file.