A non-therapeutic light adjustment method, comprising: determining, by a terminal (20, 30, 1100) with a light detection function, an awake time period and a sleep time period of a user, the awake time period and the sleep time period each comprising at least one first sub-period and/or one second sub-period, wherein the first sub-period is a daytime period, and the second sub-period is a nighttime period; determining, by the terminal (20, 30, 1100), light parameter thresholds in the awake time period and the sleep time period; obtaining, by the terminal (20, 30, 1100), a light parameter in a current time period, wherein the current time period is the awake time period or the sleep time period; and adjusting, by the terminal (20, 30, 1100) based on the light parameter in the current time period, a light parameter of light emitted by a light source device (22, 34), the light source device (22, 34) being disposed inside the terminal (20, 30, 1100) or being an independent device communicating with the terminal (20, 30, 1100), wherein the light parameter threshold comprises a lower light parameter threshold and an upper light parameter threshold; and the adjusting, by the terminal (20, 30, 1100) based on the light parameter in the current time period, the light parameter of light emitted by the light source device (22, 34) comprises: if it is determined that a light parameter in a current sub-period is less than the lower light parameter threshold in the current sub-period, adjusting, by the terminal (20, 30, 1100), the light parameter of light emitted by the light source device (22, 34) in a next sub-period of the current sub-period to a first light parameter, wherein the current sub-period is the first sub-period or the second sub-period, and the first light parameter is greater than the light parameter in the current sub-period; or if it is determined that a light parameter in a current sub-period is greater than the upper light parameter threshold in the current sub-period, adjusting, by the terminal (20, 30, 1100), the light parameter of light emitted by the light source device (22, 34) in a next sub-period of the current sub-period to a second light parameter, wherein the current sub-period is the first sub-period or the second sub-period, wherein the second light parameter is less than the light parameter in the current sub-period determining, by a terminal (20, 30, 1100) with a light detection function, an awake time period and a sleep time period of a user, the awake time period and the sleep time period each comprising at least one first sub-period and/or one second sub-period, wherein the first sub-period is a daytime period, and the second sub-period is a nighttime period; determining, by the terminal (20, 30, 1100), light parameter thresholds in the awake time period and the sleep time period; obtaining, by the terminal (20, 30, 1100), a light parameter in a current time period, wherein the current time period is the awake time period or the sleep time period; and adjusting, by the terminal (20, 30, 1100) based on the light parameter in the current time period, a light parameter of light emitted by a light source device (22, 34), the light source device (22, 34) being disposed inside the terminal (20, 30, 1100) or being an independent device communicating with the terminal (20, 30, 1100), wherein the light parameter threshold comprises a lower light parameter threshold and an upper light parameter threshold; and the adjusting, by the terminal (20, 30, 1100) based on the light parameter in the current time period, the light parameter of light emitted by the light source device (22, 34) comprises: if it is determined that a light parameter in a current sub-period is less than the lower light parameter threshold in the current sub-period, adjusting, by the terminal (20, 30, 1100), the light parameter of light emitted by the light source device (22, 34) in a next sub-period of the current sub-period to a first light parameter, wherein the current sub-period is the first sub-period or the second sub-period, and the first light parameter is greater than the light parameter in the current sub-period; or if it is determined that a light parameter in a current sub-period is greater than the upper light parameter threshold in the current sub-period, adjusting, by the terminal (20, 30, 1100), the light parameter of light emitted by the light source device (22, 34) in a next sub-period of the current sub-period to a second light parameter, wherein the current sub-period is the first sub-period or the second sub-period, wherein the second light parameter is less than the light parameter in the current sub-period if it is determined that a light parameter in a current sub-period is less than the lower light parameter threshold in the current sub-period, adjusting, by the terminal (20, 30, 1100), the light parameter of light emitted by the light source device (22, 34) in a next sub-period of the current sub-period to a first light parameter, wherein the current sub-period is the first sub-period or the second sub-period, and the first light parameter is greater than the light parameter in the current sub-period; or if it is determined that a light parameter in a current sub-period is greater than the upper light parameter threshold in the current sub-period, adjusting, by the terminal (20, 30, 1100), the light parameter of light emitted by the light source device (22, 34) in a next sub-period of the current sub-period to a second light parameter, wherein the current sub-period is the first sub-period or the second sub-period, wherein the second light parameter is less than the light parameter in the current sub-period