A display device, comprising: a display surface provided on a front surface of said display device, on which images are displayed; a first measuring unit provided on a rear surface of said display device and measuring illuminance on said rear surface due to incident outside light behind the display surface; a second measuring unit provided on said front surface of said display device and measuring illuminance on said front surface due to outside light; and a first control unit performing brightness control on said images displayed on said display surface in accordance with a measurement result of said first measuring unit; wherein said first control unit further performs said brightness control on said images displayed on said display surface in accordance with at least one of said measurement result of said first measuring-unit and a measurement result of said second measuring unit; characterized in that the display device further comprises setting units (51, 52) configured for setting, by a user, information indicating a positional relationship between said display surface and an external lighting source behind the display device, wherein said setting units (51, 52) are also configured for setting, by a user, information indicating a distance between said display surface and an outer wall behind the display device, in that the display device further comprises a second switching unit switching control setting of an operation mode of said first control unit in accordance with said positional relationship between said display surface and said external lighting source and said distance between said display surface and said outer wall, and in that the display device further comprises third and fourth reference tables (5a, 6a, 7a, 5b, 6b, 7b) used in setting of a second control value in at least any one of said brightness control, a black level control, a gamma control and a saturation control of said images, wherein said first and second measuring units (2, 1) are made to correspond to said third and fourth reference tables (5a, 6a, 7a, 5b, 6b, 7b) in an exchangeable manner, and wherein said first control unit further performs said at least any one of said brightness control, said black level control, said gamma control and said saturation control by said second control value set in said third and fourth reference tables (5a, 6a, 7a, 5b, 6b, 7b). a display surface provided on a front surface of said display device, on which images are displayed; a first measuring unit provided on a rear surface of said display device and measuring illuminance on said rear surface due to incident outside light behind the display surface; a second measuring unit provided on said front surface of said display device and measuring illuminance on said front surface due to outside light; and a first control unit performing brightness control on said images displayed on said display surface in accordance with a measurement result of said first measuring unit; wherein said first control unit further performs said brightness control on said images displayed on said display surface in accordance with at least one of said measurement result of said first measuring-unit and a measurement result of said second measuring unit; characterized in that the display device further comprises setting units (51, 52) configured for setting, by a user, information indicating a positional relationship between said display surface and an external lighting source behind the display device, wherein said setting units (51, 52) are also configured for setting, by a user, information indicating a distance between said display surface and an outer wall behind the display device, in that the display device further comprises a second switching unit switching control setting of an operation mode of said first control unit in accordance with said positional relationship between said display surface and said external lighting source and said distance between said display surface and said outer wall, and in that the display device further comprises third and fourth reference tables (5a, 6a, 7a, 5b, 6b, 7b) used in setting of a second control value in at least any one of said brightness control, a black level control, a gamma control and a saturation control of said images, wherein said first and second measuring units (2, 1) are made to correspond to said third and fourth reference tables (5a, 6a, 7a, 5b, 6b, 7b) in an exchangeable manner, and wherein said first control unit further performs said at least any one of said brightness control, said black level control, said gamma control and said saturation control by said second control value set in said third and fourth reference tables (5a, 6a, 7a, 5b, 6b, 7b).