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摘要

A history memory (430) stores the input value and execution result of a function in association with each other as an execution history on a per function identification information. A command decoder (320) supplies to an execution history search unit (410) the function identification information included in a notice command for giving notice of a function supplied from a fetch unit (310). The command decoder (320) also directs the execution history search unit (410) to acquire an input value output from an input selection unit (332), according to, among the commands read after the notice command, an input value setting command for setting the input value of the function. The execution history search unit (410) searches for an execution history that matches the acquired identification information and input value prior to a function call command. An execution result output unit (420) outputs an execution result detected by the execution history search unit (410) to an execution unit (330). The fetch unit (310) reads a command to be read next to the function.