An apparatus for and a method are provided for managing data by dividing file identifier descriptors (FIDs) included in metadata of a universal disk format (UDF) file system, and arranging them. The apparatus for managing data includes an input unit that receives a command for generating data in a file system environment, a controller that determines a data type corresponding to the command, a data generator that generates the data by referring to the command, and a metadata updater that arranges an FID with respect to the generated data according to the data type.