An endoscope system has an electronic endoscope, a signal processing section and a data transmitting and receiving section. The electronic endoscope has an image pickup element at a distal end portion of an insert section thereof to be inserted in a body. The other end portion of the endoscope is located outside the body. The signal processing section processes an image signal obtained by the image pickup element. The data transmitting and receiving section transmits and receives data to and from a network environment by radio.