A display system includes a display device including a plurality of displays to output first content received from a first server, a second server to receive the first content from the first server and to store a plurality of error patterns which is able to occur in the first content, and a photographing device to transmit second content obtained by photographing the display device to the second server. The second server displays whether a defect is present on the display device, by comparing the second content with the plurality of error patterns, when the second content is received from the photographing device.