An apparatus for storing a key value store file according to an embodiment includes a memory configured to record one or more key values in a predefined unit space based on a data input request from an outside, a controller configured to store data received from the memory in a storage, and the storage configured to include a plurality of zones. The controller is configured to perform a flush operation of storing one or more key values received from the memory as a file in a predefined format in the storage and a compaction operation of merging a plurality of files existing in one level in the storage and recording the merged files as one file in another level.