A display device having a display panel disposed in a casing, comprising: two or more temperature sensors (10, 20) disposed in different positions; specification means configured to specify correlation information in relation to at least two of the temperature sensors (10, 20); characterized by, the correlation information indicating a temporal relation between two temperatures detected by the temperature sensors (10,20); and the display device further comprising: estimation means connected to estimate an ambient temperature (Te) on the basis of the correlation information specified by the specification means and the temperatures detected by the temperature sensors (10, 20), wherein the specification means is configured to specify; (i) when a difference temperature (ΔTp-ΔTs) between a first temperature difference (ΔTp) and a second temperature difference (ΔTs), based on the temperatures detected by the temperature sensors (10, 20) is smaller than a predetermined threshold temperature (ΔTth), a correlation information where the first temperature difference (ΔTp) and the second temperature difference (ΔTs) increase at different rates with time; and (ii) when the difference temperature (ΔTp-ΔTs) between the first temperature difference (ΔTp) and the second temperature difference (ΔTs) is greater than the predetermined threshold temperature (ΔTth), a correlation information where the first temperature difference (ΔTp) and the second temperature difference (ΔTs) increase at similar rates with time. two or more temperature sensors (10, 20) disposed in different positions; specification means configured to specify correlation information in relation to at least two of the temperature sensors (10, 20); characterized by, the correlation information indicating a temporal relation between two temperatures detected by the temperature sensors (10,20); and the display device further comprising: estimation means connected to estimate an ambient temperature (Te) on the basis of the correlation information specified by the specification means and the temperatures detected by the temperature sensors (10, 20), estimation means connected to estimate an ambient temperature (Te) on the basis of the correlation information specified by the specification means and the temperatures detected by the temperature sensors (10, 20), wherein the specification means is configured to specify; (i) when a difference temperature (ΔTp-ΔTs) between a first temperature difference (ΔTp) and a second temperature difference (ΔTs), based on the temperatures detected by the temperature sensors (10, 20) is smaller than a predetermined threshold temperature (ΔTth), a correlation information where the first temperature difference (ΔTp) and the second temperature difference (ΔTs) increase at different rates with time; and (ii) when the difference temperature (ΔTp-ΔTs) between the first temperature difference (ΔTp) and the second temperature difference (ΔTs) is greater than the predetermined threshold temperature (ΔTth), a correlation information where the first temperature difference (ΔTp) and the second temperature difference (ΔTs) increase at similar rates with time. (i) when a difference temperature (ΔTp-ΔTs) between a first temperature difference (ΔTp) and a second temperature difference (ΔTs), based on the temperatures detected by the temperature sensors (10, 20) is smaller than a predetermined threshold temperature (ΔTth), a correlation information where the first temperature difference (ΔTp) and the second temperature difference (ΔTs) increase at different rates with time; and (ii) when the difference temperature (ΔTp-ΔTs) between the first temperature difference (ΔTp) and the second temperature difference (ΔTs) is greater than the predetermined threshold temperature (ΔTth), a correlation information where the first temperature difference (ΔTp) and the second temperature difference (ΔTs) increase at similar rates with time.