An endoscope system apparatus, which facilitate to carry out observation and diagnosis of a fine structure of an object and enable to carry out efficient recording operation by attaching wavelength information in recording a spectral image, is provided. The endoscope system apparatus has a color space conversion processing circuit for carrying out matrix operation by data of an original image and matrix data and forming a spectral image including signals of selected wavelength regions. By one time operation of a recording operation switch, data of the spectral images is transmitted to an image recording apparatus along with data of the original image, and the spectral images are communicated by adding wavelength information of the signals thereto. Further, the spectral images are displayed on a monitor along with the original image.
