Provided is a storage apparatus that stores data update histories using an existing file system without modifying the source code of the existing file system. The storage apparatus includes an I/O command catcher that changes, when an I/O command is issued from a program stored in a memory and arbitrary update data is stored in a data area address corresponding to a buffer address storing the arbitrary update data, authorized access set for the arbitrary update data in a page management unit to readable; and a page exception catcher that issues, when the authorized access of the arbitrary update data is changed to readable, a page exception report, acquires a data area address corresponding to the buffer address storing the arbitrary update data in the address management unit, and stores the update data and its update history in an update queue.