Plan adjustment system and plan adjustment method

The purpose of the present invention is to adjust a plurality of plans such that specific performance evaluation indices among a plurality of performance evaluation indices are at optimal values. A processor acquires plan collection information which includes a plurality of instances of plan information which relates to a resource. The processor acquires adjustment range information which indicates a range within which each of the instances of plan information may be adjusted. The processor acquires causal relation information which indicates causal relations between the plurality of instancesof plan information and a plurality of performance evaluation indices. The processor acquires constraint conditions of preset conditional performance evaluation indices from among the plurality of performance evaluation indices. The processor changes the plan collection information on the basis of the constraint conditions and the adjustment range information, creating a plurality of plan collection information candidate