A policy determination apparatus comprising: a monitoring data acquisition unit configured to acquire monitoring data relating to states of facilities on a network, the monitoring data being received from an external device; a metrics generation unit configured to generate, based on the monitoring data, time-series data of a plurality of types of metrics associated with each of a plurality of candidates of routing destinations to which a routing control apparatus routes requests including first destination data; a routing destination evaluation unit configured to evaluate the candidates based on the time-series data of the types of metrics associated with the candidates and priorities assigned to the types of metrics to generate routing destination evaluation data; an evaluation providing unit configured to provide a first customer device with the routing destination evaluation data, the first customer device being authorized to set weights for determining a policy; a weight acquisition unit configured to acquire weights for the candidates transmitted by the first customer device in response to reception of the routing destination evaluation data by the first customer device; a policy determination unit configured to generate or update a policy that the routing control apparatus uses for control of the routing destinations such that the routing control apparatus routes the requests to the candidates in proportions being based on the acquired weights; and a policy notification unit configured to notify the routing control apparatus of the policy, wherein the weights received from the first customer device include first weights to be assigned to the candidates in a first time slot, and second weights to be assigned to the candidates in a second time slot that differs from the first time slot, and the policy determination unit is configured to generate or update the policy such that the routing control apparatus routes the requests to the candidates in proportions being based on the first weights over the first time slot, and routes the requests to the candidates in proportions being based on the second weights over the second time slot. a monitoring data acquisition unit configured to acquire monitoring data relating to states of facilities on a network, the monitoring data being received from an external device; a metrics generation unit configured to generate, based on the monitoring data, time-series data of a plurality of types of metrics associated with each of a plurality of candidates of routing destinations to which a routing control apparatus routes requests including first destination data; a routing destination evaluation unit configured to evaluate the candidates based on the time-series data of the types of metrics associated with the candidates and priorities assigned to the types of metrics to generate routing destination evaluation data; an evaluation providing unit configured to provide a first customer device with the routing destination evaluation data, the first customer device being authorized to set weights for determining a policy; a weight acquisition unit configured to acquire weights for the candidates transmitted by the first customer device in response to reception of the routing destination evaluation data by the first customer device; a policy determination unit configured to generate or update a policy that the routing control apparatus uses for control of the routing destinations such that the routing control apparatus routes the requests to the candidates in proportions being based on the acquired weights; and a policy notification unit configured to notify the routing control apparatus of the policy, wherein the weights received from the first customer device include first weights to be assigned to the candidates in a first time slot, and second weights to be assigned to the candidates in a second time slot that differs from the first time slot, and the policy determination unit is configured to generate or update the policy such that the routing control apparatus routes the requests to the candidates in proportions being based on the first weights over the first time slot, and routes the requests to the candidates in proportions being based on the second weights over the second time slot.