Technologies are generally described for transmitting electric power using electromagnetic waves. The application executing unit executes an application according to operation content received from an external terminal apparatus and outputs a printing command to print an execution result. The oxidation catalyst unit comprises a duct connected to the fusing unit to guide the carrier vapor generated in the fusing unit into the oxidation catalyst unit, a fan for guiding the carrier vapor into the duct, and a controller for varying a velocity of the fan according to data.