To provide a simple and low-cost system for achieving cooperation between access authentication and log-in authentication.

A log-in identification information acquiring part 17 of an cooperation device 1 holding correspondence information between an access ID and a log-in ID, acquires a log-in ID of a processing object relating to log-in authentication from a log-in management system 3. An access information acquiring part 16 acquires an access history including the access ID from an access management system 2 at predetermined intervals. A log-in setting request part 18 transmits to the log-in management system 3 a request to validate the log-in ID of the processing object if the access history for the access ID corresponding to the log-in ID of the processing object shows "entry", and a request to invalidate the log-in ID of the processing object if the access history for the access ID shows "exit".

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