A medical system includes an endoscope apparatus including a plurality of insertion portions and a main unit supporting them a sheath unit attachable to a biological subject and having a through-hole through which the insertion portions can be passed a monitor barcodes from which the insertion portions issue identification information an identification-signal generating unit that acquires the identification information from the barcodes and outputs this to the main unit every time the insertion portions pass through the through-hole wherein the main unit includes an image selector that displays, on the monitor, an image acquired by the insertion portion identified by the main unit as having being have passed through the sheath unit on the basis of the identification information from the identification-signal generating unit.
