An object of the present invention is to provide a simulator for verifying plural products with common hardware configuration, in which peripheral hardware that can be reused are constituted by hardware and other peripheral hardware is constituted by software simulator, and simulation method.A simulator comprises: a hardware section that includes a peripheral hardware configuration with a structure required for a CPU and OS to operate alone; a software section that simulates the operation of peripheral hardware other than hardware constituting the hardware section as a peripheral hardware model; and an interface board that connects the hardware section and software section.