The endoscope apparatus images and images a subject having a light emitting unit that generates first narrow band light and second narrow band light as illumination light, and a region including hemoglobin irradiated with the illumination light. An image capturing unit that outputs a signal, a first image obtained by capturing an image of a subject illuminated by the first narrowband light, and an image capturing of an object illuminated by the second narrowband light An image processing unit that performs predetermined image processing on at least one of the second image and outputs the image, and uses the first and second images obtained as the processing result of the predetermined image processing. Of the imaging signal output from the imaging unit in response to the irradiation of the first narrowband light, based on the current operating state of the observation image generation unit that generates the observation image and the light source that generates the first narrowband light. Signal strength information relating to the signal strength is acquired, and control is performed to maintain the brightness ratio of the first and second images used to generate the observed image at a constant ratio based on the signal strength information. And a control unit.内視鏡装置は、第１の狭帯域光と、第２の狭帯域光と、を照明光として発生する発光部と、照明光が照射されたヘモグロビンを含む領域を有する被写体を撮像して撮像信号を出力する撮像部と、第１の狭帯域光が照射された被写体を撮像して得られた第１の画像と、第２の狭帯域光が照射された被写体を撮像して得られた第２の画像と、のうちの少なくとも１つの画像に対して所定の画像処理を施して出力する画像処理部と、所定の画像処理の処理結果として得られた第１及び第２の画像を用いて観察画像を生成する観察画像生成部と、第１の狭帯域光を発生する光源の現在の動作状態に基づき、第１の狭帯域光の照射に応じて撮像部から出力される撮像信号の信号強度に係る信号強度情報を取得し、さらに、信号強度情報に基づき、観察画像の生成に用いられる第１及び第２の画像の明るさの比率を一定の比率に維持するための制御を行う制御部と、を有する。
