A medical control apparatus comprising: a processing unit configured to cause a first display region to be displayed in which a thumbnail image corresponding to an image of an input source is to be displayed and a second display region to be displayed in which a thumbnail image corresponding to an image input to an output destination of the image of the input source is to be displayed and in which a thumbnail image corresponding to an image input to an output destination of part of the image of the input source is to be displayed and a third display region to be displayed in which an object for controlling a parameter of the input source or the output destination is to be displayed, the first, second and third display regions being caused to be displayed in one screen; to cause the thumbnail image to be displayed in the second display region corresponding to the image input to the output destination of the image of the input source; to cause the thumbnail image to be displayed in the second display region corresponding to the image input to the output destination of the part of the image of the input source; to cause the object for controlling the parameter of the input source to be displayed in the third display region; to cause the output destination of the image of the input source to be specified on a basis of manipulation with respect to the second display region, the output destination of the image of the input source being selected through manipulation with respect to the second display region;,and to cause the output destination of the part of the image of the input source selected through manipulation with respect to the first display region, to be further specified on a basis of manipulation with respect to the first display region and manipulation with respect to the second display region, the output destination of the part of the image of the input source being selected through manipulation with respect to the second display region, wherein in the case that the parameter of the input source and/or the output destination of the image of the input source or the output destination of the part of the image of the input source is adjusted by the object in the third display region, the thumbnail images in the first display region and/or the second display region reflect the adjustment. a processing unit configured to cause a first display region to be displayed in which a thumbnail image corresponding to an image of an input source is to be displayed and a second display region to be displayed in which a thumbnail image corresponding to an image input to an output destination of the image of the input source is to be displayed and in which a thumbnail image corresponding to an image input to an output destination of part of the image of the input source is to be displayed and a third display region to be displayed in which an object for controlling a parameter of the input source or the output destination is to be displayed, the first, second and third display regions being caused to be displayed in one screen; to cause the thumbnail image to be displayed in the second display region corresponding to the image input to the output destination of the image of the input source; to cause the thumbnail image to be displayed in the second display region corresponding to the image input to the output destination of the part of the image of the input source; to cause the object for controlling the parameter of the input source to be displayed in the third display region; to cause the output destination of the image of the input source to be specified on a basis of manipulation with respect to the second display region, the output destination of the image of the input source being selected through manipulation with respect to the second display region;,and to cause the output destination of the part of the image of the input source selected through manipulation with respect to the first display region, to be further specified on a basis of manipulation with respect to the first display region and manipulation with respect to the second display region, the output destination of the part of the image of the input source being selected through manipulation with respect to the second display region, wherein in the case that the parameter of the input source and/or the output destination of the image of the input source or the output destination of the part of the image of the input source is adjusted by the object in the third display region, the thumbnail images in the first display region and/or the second display region reflect the adjustment.