Disclosed are an apparatus and a method for managing a file system. The apparatus of managing file system including a user input unit that an input value corresponding to a predetermined data is input, a data storage unit comprising several data blocks having a predetermined size able to store the data, and a information storage unit that stores data information about the data stored in the data block, and a control unit that stores data corresponding to the input value in an empty space of each data block by using the stored data information.