Abstract: A storage system of the present invention includes: a data writing means for storing actual data configuring storage data into a storage device and, for every update of the content of the storage data, newly storing; and a data specifying means for specifying the latest storage data among the same storage data stored in the storage device. The data writing means is configured to store actual data configuring storage data in association with update information whose value increases by 1 for every update. The data specifying means is configured to check whether update information whose value is 2i (i represents an integer of 0 or more) exists in the storage device in increasing order of the value of i, and specify the largest value of the existing update information among values between the largest value of 2i that corresponding update information exists and 2i+1.

Abstract: A storage system of the present invention includes: a data writing means for storing actual data configuring storage data into a storage device and, for every update of the content of the storage data, newly storing; and a data specifying means for specifying the latest storage data among the same storage data stored in the storage device. The data writing means is configured to store actual data configuring storage data in association with update information whose value increases by 1 for every update. The data specifying means is configured to check whether update information whose value is 2i (i represents an integer of 0 or more) exists in the storage device in increasing order of the value of i, and specify the largest value of the existing update information among values between the largest value of 2i that corresponding update information exists and 2i+1.