The present invention easily estimates an assessment of impact accompanying system migration. A function analyzer 1 is provided with: a call input unit 21 for inputting a call to a call processing system 2; an access log acquisition unit 22 that, when the call processing system 2 processes a call, acquires, from each function realization unit 61 constituting the call processing system 2, access log data in which the identifier of a function realization unit 61 that has accessed to-be-evaluated data and the identifier of a thread when the to-be-evaluated data is accessed are correlated to each other; and an analysis unit 23 that, when a plurality of thread identifiers are correlated to the identifier of a prescribed function realization unit 61, determines that the prescribed function realization unit 61 is a multi-processing unit, and when a single thread identifier is correlated, determines that the prescribed function realization unit 61 is a single-processing unit.
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