To provide a recommendation guarantee system capable of recommending a provider while also taking a daily changing state of the provider into consideration.SOLUTION: A recommendation guarantee system (1) comprises: first acquisition means (34) for acquiring sequentially changing biological information on each of a plurality of providers providing a service; storage means (14) for storing a plurality of pieces of provider information respectively corresponding to the providers and respectively including the acquired biological information; and second acquisition means/selection means (12) for acquiring request information on the service, extracting an item related to an item included in the request information from the respective pieces of provider information as an environmental condition, obtaining reliability indicating a degree of confidence relating to each provider on the basis of the biological information included in the respective pieces of provider information, and selecting the provider providing the service on the basis of the request information, the environmental condition, and the reliability.SELECTED DRAWING: Figure 1
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