To provide a system having a considerably high fuel saving effect by only attaching a simple device while an engine structure is the same as a conventional structure.

A mixed gas generating device capable of filling the mixture gas of hydrogen and oxygen to be generated by the electrolysis of water in a combustion chamber is attached to a diesel engine and a power generation apparatus. Further, a fuel reforming device capable of applying the magnetic field to a fuel is attached on the way before the fuel is supplied from a fuel tank to the inside of the combustion chamber.