To provide a file system including: a storage system having a plurality of volumes; a volume allocation table adapted to set the plurality of volumes for each directory; a file allocation table that stores attributes and divided block information of the file; a block reading table in which numbers of blocks read out in one reading operation for each volume are respectively set; and a read control module that controls to read data from the volume; wherein a read control module, when a read command is received, determines a volume to be read from the volume allocation table, determines the number of blocks read for each volume by referring to the block reading table, determines the blocks read for each volume based on the volume, the number of blocks, and the block information, and reads from each volume in parallel.