Control method and display device

A control method for a display system including a first device, a second device, and a display device that establishes first communication with the first device via a wired cable, that is configured to communicate with the second device, and that is configured to display an image in a display region, wherein

• the first device and the display device are configured to communicate with each other via a network,
• the first device does not store an application program,
• the second device stores the application program, and
• the display device
• when information from the second device requesting a second communication between the second device and the display device is received by the application program while a first image is being displayed in the display region, transmits, to the first device via the network or the wired cable, information indicating that the second communication was requested and
• when information indicating that the second communication was accepted is received from the first device via the network or the wired cable, establishes the second communication.