To enable to start and stop the flow of inactive gas to a standard electric surgery pencil during an electrical surgery operation.

By operating an electric surgery energy request button of an electric surgery pencil 13, the flow of electric surgery energy from an electric surgery generator 11 and the flow of inactive gas from the flow control valve of an gaseous surgery unit 26 are supplied at a time. An automatic switch 16 connected to an energy source 14 is opened and closed by the energy flow when a surgeon operates the electric surgery energy request button, the flow control valve of the gaseous surgery unit 26 is activated to control the inactive gas to the pencil, and the electric surgery generator 11 is activated and energy is supplied to the pencil.