| 摘要 |
A tally generating device 10 generates a plurality of pieces of tally data, based on confidential information S and tally generation instruction information. The tally data includes tally main data and tally sub data, and the tally sub data indicates a condition relating to restoration of the confidential information S in each of confidential information restoring devices. When restoring the confidential information S, each of the confidential information restoring devices collects the required number of pieces of tally data, and judges whether or not the restoration of the confidential information S is permitted, based on the tally sub data. When judging that "Restoration is permitted", each of the confidential information, restoring devices restores the confidential information S, and when judging that "Restoration is not permitted", each of the confidential information restoring devices cannot restore the confidential information S.
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