When a management server receives a request for reservation cancellation, the management server performs a process including: a step of specifying a user and obtaining reservation information; a step of adding “1” to the number of cancellations having a large degree of influence when a period until the next reservation is within A hours; a step of calculating an estimate of the rental fee applied after the reservation cancellation is confirmed, when the number of cancellations having a large degree of influence after the addition is more than or equal to a threshold value; and a step of notifying the estimate.
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