| CPC G06K 7/10366 (2013.01) | 7 Claims |

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1. An information processing system comprising:
a first radio tag storing unique tag identification information, the first radio tag configured to be attached to a seating surface or a backrest surface of a seating unit; and
an information processing device comprising:
a storage that stores information on a user of a seating unit and tag identification information of a radio tag attached to a seating unit, in an associated manner, and
a processor configured to:
acquire the tag identification information when the first radio tag transmits a signal containing the tag identification information, and
determine whether the user is seated on the seating unit, based on acquisition or non-acquisition of the tag identification information.
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