In an endoscope system, an image processing section on a processor side detects a movement amount or a distance in an image. An endoscopic-procedure-scene classifying section classify, from a feature value, to which of endoscopic procedure scene a scene of an image corresponds and further determines whether reliability of the classified endoscopic procedure scene is low. When the reliability is low, the endoscopic-procedure-scene classifying section decides a target compression ratio from an endoscopic procedure scene classified in the past, and transmits a compression parameter corresponding to the target compression ratio to a wireless endoscope. The wireless endoscope performs wireless transmission of an image compressed with the compression parameter.
