A display system for displaying a document includes a tablet terminal and a head mounted display device (HMD). The tablet terminal includes a display device which does not display confidential information that a third party is not allowed to browse, but displays non-confidential information that the third party is allowed to browse with regard to the document. The HMD includes a glasses-type display unit which does not allow the third party to browse, but allows a HMD user to browse, a communication unit which receives the confidential information, and a video camera for capturing the non-confidential information displayed on the display device. The glasses-type display unit, based on the captured non-confidential information, displays the received confidential information so that the received confidential information is visually recognized by the HMD user in a state of being aligned with the non-confidential information displayed on the display device.