A display control device comprising: a system controller configured to: acquire a state of a line of sight of a user viewing a see-through display which is worn on the user in front of the user's eye, send a first instruction to increase a visibility of a display of notification information when the system controller receives an interrupt related to the notification information while the see-through display is being used when the system controller determines that the line of sight of the user is close to the display of the notification information, send a second instruction to decrease the visibility of the display of the notification information when the system controller determines that the line of sight of the user is located away from the display of the notification information; and a display control unit configured to perform, according to the first instruction from the system controller , display control on the see-through display so that the visibility of the display of the notification information gradually increases immediately after the system controller receives the interrupt, and configured to perform the display control according to the second instruction from the system controller , wherein the system controller is configured to acquire an intensity of ambient light, wherein the display control unit is configured perform the display control so that the visibility of the display of the notification information gradually increases according to the intensity of the ambient light. a system controller configured to: acquire a state of a line of sight of a user viewing a see-through display which is worn on the user in front of the user's eye, send a first instruction to increase a visibility of a display of notification information when the system controller receives an interrupt related to the notification information while the see-through display is being used when the system controller determines that the line of sight of the user is close to the display of the notification information, send a second instruction to decrease the visibility of the display of the notification information when the system controller determines that the line of sight of the user is located away from the display of the notification information; and acquire a state of a line of sight of a user viewing a see-through display which is worn on the user in front of the user's eye, send a first instruction to increase a visibility of a display of notification information when the system controller receives an interrupt related to the notification information while the see-through display is being used when the system controller determines that the line of sight of the user is close to the display of the notification information, send a second instruction to decrease the visibility of the display of the notification information when the system controller determines that the line of sight of the user is located away from the display of the notification information; and a display control unit configured to perform, according to the first instruction from the system controller , display control on the see-through display so that the visibility of the display of the notification information gradually increases immediately after the system controller receives the interrupt, and configured to perform the display control according to the second instruction from the system controller , wherein the system controller is configured to acquire an intensity of ambient light, wherein the display control unit is configured perform the display control so that the visibility of the display of the notification information gradually increases according to the intensity of the ambient light. <EOS>