A disclosed policy introduced effect prediction apparatus includes a memory storing a set of instructions of a policy introduced effect prediction program, and processors programed to execute the instructions to perform a policy introduced effect prediction process. The policy introduced effect prediction process includes calculating at least one calculation model based on first difference data calculated based on time series data of an objective variable and second difference data calculated based on time series data of an explanatory variable, calculating a difference amount of the objective variable by inputting a difference amount of the explanatory variable for introducing a policy into the calculated calculation model, and calculating a predicted value of the objective variable in response to introduction of the policy by adding the calculated difference amount of the objective variable to a predicted value of the objective variable in the absence of the introduction of the policy.
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