A medical system comprising: a light source apparatus configured to supply a light source for obtaining an endoscopic image into a body cavity; a display apparatus configured to display the endoscopic image; and a control apparatus configured to control a plurality of controlled apparatuses, wherein: the control apparatus includes: a discriminating section configured to discriminate whether the endoscopic image is displayed on the display apparatus; and a control section configured to perform control to display, when it is discriminated by the discriminating section that the endoscopic image is displayed on the display apparatus, a first operation instruction screen for instructing operation of the controlled apparatuses and the endoscopic image on the display apparatus and display, when it is discriminated by the discriminating section that the endoscopic image is not displayed on the display apparatus, a second operation instruction screen for performing a check of operation states of the controlled apparatuses and an operation instruction of the controlled apparatuses on the display apparatus, the discriminating section is configured to identify a lighting state of a lamp of the light source apparatus and, when identifying that the lamp is lit, configured to discriminate that the endoscopic image is displayed on the display apparatus and, when identifying that the lamp is not lit, configured to discriminate that the endoscopic image is not displayed on the display apparatus, the control apparatus includes a voice recognizing section and is configured to control the controlled apparatuses according to a voice input, and when a predetermined voice is inputted to the voice recognizing section, the discriminating section is configured to discriminate whether the endoscopic image is displayed on the display apparatus. a light source apparatus configured to supply a light source for obtaining an endoscopic image into a body cavity; a display apparatus configured to display the endoscopic image; and a control apparatus configured to control a plurality of controlled apparatuses, wherein: the control apparatus includes: a discriminating section configured to discriminate whether the endoscopic image is displayed on the display apparatus; and a control section configured to perform control to display, when it is discriminated by the discriminating section that the endoscopic image is displayed on the display apparatus, a first operation instruction screen for instructing operation of the controlled apparatuses and the endoscopic image on the display apparatus and display, when it is discriminated by the discriminating section that the endoscopic image is not displayed on the display apparatus, a second operation instruction screen for performing a check of operation states of the controlled apparatuses and an operation instruction of the controlled apparatuses on the display apparatus, the discriminating section is configured to identify a lighting state of a lamp of the light source apparatus and, when identifying that the lamp is lit, configured to discriminate that the endoscopic image is displayed on the display apparatus and, when identifying that the lamp is not lit, configured to discriminate that the endoscopic image is not displayed on the display apparatus, the control apparatus includes a voice recognizing section and is configured to control the controlled apparatuses according to a voice input, and when a predetermined voice is inputted to the voice recognizing section, the discriminating section is configured to discriminate whether the endoscopic image is displayed on the display apparatus. the control apparatus includes: a discriminating section configured to discriminate whether the endoscopic image is displayed on the display apparatus; and a control section configured to perform control to display, when it is discriminated by the discriminating section that the endoscopic image is displayed on the display apparatus, a first operation instruction screen for instructing operation of the controlled apparatuses and the endoscopic image on the display apparatus and display, when it is discriminated by the discriminating section that the endoscopic image is not displayed on the display apparatus, a second operation instruction screen for performing a check of operation states of the controlled apparatuses and an operation instruction of the controlled apparatuses on the display apparatus, the discriminating section is configured to identify a lighting state of a lamp of the light source apparatus and, when identifying that the lamp is lit, configured to discriminate that the endoscopic image is displayed on the display apparatus and, when identifying that the lamp is not lit, configured to discriminate that the endoscopic image is not displayed on the display apparatus, the control apparatus includes a voice recognizing section and is configured to control the controlled apparatuses according to a voice input, and when a predetermined voice is inputted to the voice recognizing section, the discriminating section is configured to discriminate whether the endoscopic image is displayed on the display apparatus.