A method for creating an intermediate representation is performed by one or more processors and includes by an intermediate representation creation unit, extracting, from the program, information on data for input and output and information on operation, by the intermediate representation creation unit, determining the presence or absence of an in-place operation based on the extracted information on data and the extracted information on operation, and by the intermediate representation creation unit, if there is the in-place operation, creating an intermediate representation using the extracted information on data, the extracted information on operation, and a creation rule associated with the in-place operation, in which input data of the in-place operation is data that is replaced with output data after the in-place operation.