An endoscope system includes: an electronic endoscope that obtains an image of an inside of a subject; a first storage unit that is provided at the electronic endoscope and that stores first information, the first information including white balance data that depends on an apparatus used in the past together with the electronic endoscope; an image processing apparatus that is connected to the electronic endoscope and that applies processing to an image of the subject; a second storage unit that is provided at the image processing apparatus or a storage medium connected to the image processing apparatus and that stores second information, the second information including white balance correction data for correcting the white balance data; and a white balance adjustment unit that adjusts the white balance of the image obtained by the electronic endoscope, on the basis of the first information and the second information.