A simulation method executable by a computer that executes a simulation of an instruction execution of a program for a target processor, the method including: setting, to be a predicted result, an execution result of processing a memory access instruction; executing a functional simulation of an instruction execution based on an assumption of the predicted result, and obtaining timing information, so as to calculate an execution time for the memory access instruction in the case of the predicted result; generating and executing a host code; determining a type of memory to be accessed in the memory access instruction; and correcting an execution time for the memory access instruction in the case of the predicted result using a value corresponding to a result of determining the type of the memory, so as to obtain an execution time for the memory access instruction in the functional simulation.