Display method and display system

A display system comprising:

• a first display device;
• and
• a second display device, wherein
• the first display device
• acquires a master image,
• acquires a first aspect ratio of a first display area, the first display area being an area in which a first image is displayed by the first display device,
• sets a first region in a master region of the master image based on the first aspect ratio, and
• displays, on the first display area, the first image obtained by cutting out an image portion inside the first region in the master image,
• the first display device or the second display device
• acquires a second aspect ratio of a second display area, the second display area being an area in which a second image is displayed by the second display device, and
• sets, in the master region, a second region having an overlapping region that overlaps the first region and a non-overlapping region that does not overlap the first region in at least one of a first direction and a second direction that are orthogonal to each other in the master region, based on the second aspect ratio,
• the second display device displays, on the second display area, the second image obtained by cutting out an image portion inside the second region in the master image,
• the first display device sets a positional relationship between the first region and the second region, and
• the first display device or the second display device updates, when an update is made to one of the first region and the second region, the other region to maintain the positional relationship.