A data restoring system including a backup storage that stores data; a storage device that receives the data from the backup storage; and, a data control device that selects the data transmitted from the backup storage to the storage device, the data restoring system comprising: a first distribution index information obtaining unit that obtains, as first distribution index information, first data arrangement information concerning data being stored in the backup storage, the first data arrangement information indicative of data arrangement of the storage device at the time when the data being stored in the backup storage were stored in the storage device; a configuration information request unit that requests, from the storage device, system configuration information indicating a configuration of storage areas that the storage device has, and second distribution index information indicating second data arrangement information indicative of current data arrangement of the storage device; a second distribution index information generation unit that generates the system configuration information and the second distribution index information requested by the configuration information request unit on the basis of the configuration of the storage areas; and, a new data arrangement information generation unit that generates new data arrangement information at least a part of which contains the first distribution index information obtained by the first distribution index information obtaining unit, on the basis of the system configuration information and the second distribution index information generated by the device distribution index information generation unit, and the first distribution index information, wherein the new data arrangement information generation unit stores the data being stored in the backup storage into the storage areas on the basis of the generated new data arrangement information. a first distribution index information obtaining unit that obtains, as first distribution index information, first data arrangement information concerning data being stored in the backup storage, the first data arrangement information indicative of data arrangement of the storage device at the time when the data being stored in the backup storage were stored in the storage device; a configuration information request unit that requests, from the storage device, system configuration information indicating a configuration of storage areas that the storage device has, and second distribution index information indicating second data arrangement information indicative of current data arrangement of the storage device; a second distribution index information generation unit that generates the system configuration information and the second distribution index information requested by the configuration information request unit on the basis of the configuration of the storage areas; and, a new data arrangement information generation unit that generates new data arrangement information at least a part of which contains the first distribution index information obtained by the first distribution index information obtaining unit, on the basis of the system configuration information and the second distribution index information generated by the device distribution index information generation unit, and the first distribution index information, wherein the new data arrangement information generation unit stores the data being stored in the backup storage into the storage areas on the basis of the generated new data arrangement information.