A power request signal representing the amount of power that the endoscope control section (21) of the electronic endoscope (2) should supply to the electronic endoscope (2) according to the operating state of the in-scope electric circuit (22). Is generated and transmitted to the video processor (1), and the power control unit (11) of the video processor (1) is represented by the received power request signal in the power variable unit (12) and the variable regulator (13). An electronic endoscope system that outputs electric power of electric energy to the electronic endoscope (2).電子内視鏡（２）の内視鏡制御部（２１）が、スコープ内電気回路（２２）の動作状態に応じて電子内視鏡（２）に供給されるべき電力量を表す電力要求信号を生成してビデオプロセッサ（１）へ送信し、ビデオプロセッサ（１）の電源制御部（１１）が、電力可変部（１２）および可変レギュレータ（１３）に、受信した電力要求信号により表される電力量の電力を電子内視鏡（２）へ出力させる電子内視鏡システム。
