An endoscope system comprising a user system and a remote operation system, comprising: an endoscope (3A, 3B) provided in the user system and configured to pick up an image of a subject in a body cavity by an image-pickup section; a signal processing section provided in the user system and configured to output the image of the subject obtained by processing image-pickup signals from the endoscope (3A, 3B); a light source provided in the user system and configured to supply illumination light for illuminating the subject to the endoscope (3A, 3B); a setting value changing section (138, 150; 14, 150a; 138, 300) provided in the user system and configured to perform operation for changing a setting value related to operation of at least one of the endoscope (3A, 3B), the signal processing section, and the light source; a control section (136-138, 150; 14, 136, 143, 144, 150a; 136-138, 300) configured to control the endoscope (3A, 3B), the signal processing section, and the light source, based on the setting value set according to operation of the setting value changing section (138, 150; 14, 150a; 138, 300); a log recording section provided in the user system and configured to record change history of the setting value as setting state log data; a data sending section (143, 145, 182, 202, 203) provided in the user system and configured to send the setting state log data to the remote operation system via a network (6, 7); and a command receiving section (143, 145, 203, 204, 183) configured to receive a control command which is based on the setting state log data from the remote operation system via the network (6, 7), characterized in that the control section (136-138, 150; 14, 136, 143, 144, 150a; 136-138, 300) is adapted to control the setting value changing section (138, 150; 14, 150a; 138, 300) based on the control command received from the remote operation system, and the remote operation system comprises a log data analyzing section configured to analyze the received setting state log data and generate the control command. an endoscope (3A, 3B) provided in the user system and configured to pick up an image of a subject in a body cavity by an image-pickup section; a signal processing section provided in the user system and configured to output the image of the subject obtained by processing image-pickup signals from the endoscope (3A, 3B); a light source provided in the user system and configured to supply illumination light for illuminating the subject to the endoscope (3A, 3B); a setting value changing section (138, 150; 14, 150a; 138, 300) provided in the user system and configured to perform operation for changing a setting value related to operation of at least one of the endoscope (3A, 3B), the signal processing section, and the light source; a control section (136-138, 150; 14, 136, 143, 144, 150a; 136-138, 300) configured to control the endoscope (3A, 3B), the signal processing section, and the light source, based on the setting value set according to operation of the setting value changing section (138, 150; 14, 150a; 138, 300); a log recording section provided in the user system and configured to record change history of the setting value as setting state log data; a data sending section (143, 145, 182, 202, 203) provided in the user system and configured to send the setting state log data to the remote operation system via a network (6, 7); and a command receiving section (143, 145, 203, 204, 183) configured to receive a control command which is based on the setting state log data from the remote operation system via the network (6, 7), characterized in that the control section (136-138, 150; 14, 136, 143, 144, 150a; 136-138, 300) is adapted to control the setting value changing section (138, 150; 14, 150a; 138, 300) based on the control command received from the remote operation system, and the remote operation system comprises a log data analyzing section configured to analyze the received setting state log data and generate the control command.