Abstract: A control method includes: obtaining picture signals and visible light signals; deciding a luminance change pattern by modulating the visible light signals; transmitting the visible light signals by performing luminance change of LEDs included in a panel in accordance with the luminance change pattern, in a first period that is a partial period of a frame display period; correcting a second gradient indicated by the picture signals, in accordance with a first gradient that is a gradient of the luminance change pattern of the first period, in a second period that follows the first period; and lighting the LEDs at the corrected second gradient in the second period.