An apparatus includes a processor coupled to a memory and configured to extract a class in which a constructor or an assignment operator included in source code or a combination of the constructor and the operator is used, identify a call to the constructor or operator or the combination, calculate the number of times of access to member variables, indicated in the call identified and a periphery of the call; compare the number, calculated, of times of the access with the number of times of memory access, and generate intermediate code having, added thereto, information to be used to execute a process for copying the constructor or the operator or the combination in units of member variables, and generate intermediate code having information added thereto based on the call when the number, calculated, of times of the access is smaller than the number of times of the memory access.