A dormancy controlling method for an on board computing platform (120; 340; 580) on a vehicle, comprising: determining a dormancy level corresponding to the on board computing platform (120; 340; 580); and controlling, according to the dormancy level, operating states of at least one processor and an external device controlled by the at least one processor in the on board computing platform (120; 340; 580); characterized in that the determining a dormancy level corresponding to the on board computing platform (120; 340; 580) comprises: detecting a duration that the on board computing platform (120; 340; 580) has not been operated since the vehicle is started; and determining, according to the duration, the dormancy level corresponding to the on board computing platform (120; 340; 580), wherein the determining, according to the duration, the dormancy level corresponding to the on board computing platform (120; 340; 580) comprises: determining, according to the duration, the dormancy level corresponding to the on board computing platform (120; 340; 580) by comparing the duration with preset time thresholds; wherein the different dormancy levels correspond to the different preset time thresholds, and the time thresholds comprise a first time threshold, a second time threshold, and a third time threshold that are sequentially increased in duration, wherein the larger the time threshold is, the higher a ratio of dormant devices in the on board computing platform (120; 340; 580) in the corresponding dormancy level is; and the dormancy level comprises a first-level dormancy, a second-level dormancy and a third-level dormancy in which the ratio of the dormant devices in the on board computing platform (120; 340; 580) increases sequentially. determining a dormancy level corresponding to the on board computing platform (120; 340; 580); and controlling, according to the dormancy level, operating states of at least one processor and an external device controlled by the at least one processor in the on board computing platform (120; 340; 580); characterized in that the determining a dormancy level corresponding to the on board computing platform (120; 340; 580) comprises: detecting a duration that the on board computing platform (120; 340; 580) has not been operated since the vehicle is started; and determining, according to the duration, the dormancy level corresponding to the on board computing platform (120; 340; 580), wherein the determining, according to the duration, the dormancy level corresponding to the on board computing platform (120; 340; 580) comprises: determining, according to the duration, the dormancy level corresponding to the on board computing platform (120; 340; 580) by comparing the duration with preset time thresholds; wherein the different dormancy levels correspond to the different preset time thresholds, and the time thresholds comprise a first time threshold, a second time threshold, and a third time threshold that are sequentially increased in duration, wherein the larger the time threshold is, the higher a ratio of dormant devices in the on board computing platform (120; 340; 580) in the corresponding dormancy level is; and the dormancy level comprises a first-level dormancy, a second-level dormancy and a third-level dormancy in which the ratio of the dormant devices in the on board computing platform (120; 340; 580) increases sequentially. detecting a duration that the on board computing platform (120; 340; 580) has not been operated since the vehicle is started; and determining, according to the duration, the dormancy level corresponding to the on board computing platform (120; 340; 580), wherein the determining, according to the duration, the dormancy level corresponding to the on board computing platform (120; 340; 580) comprises: determining, according to the duration, the dormancy level corresponding to the on board computing platform (120; 340; 580) by comparing the duration with preset time thresholds; wherein the different dormancy levels correspond to the different preset time thresholds, and the time thresholds comprise a first time threshold, a second time threshold, and a third time threshold that are sequentially increased in duration, wherein the larger the time threshold is, the higher a ratio of dormant devices in the on board computing platform (120; 340; 580) in the corresponding dormancy level is; and the dormancy level comprises a first-level dormancy, a second-level dormancy and a third-level dormancy in which the ratio of the dormant devices in the on board computing platform (120; 340; 580) increases sequentially. determining, according to the duration, the dormancy level corresponding to the on board computing platform (120; 340; 580) by comparing the duration with preset time thresholds; wherein the different dormancy levels correspond to the different preset time thresholds, and the time thresholds comprise a first time threshold, a second time threshold, and a third time threshold that are sequentially increased in duration, wherein the larger the time threshold is, the higher a ratio of dormant devices in the on board computing platform (120; 340; 580) in the corresponding dormancy level is; and the dormancy level comprises a first-level dormancy, a second-level dormancy and a third-level dormancy in which the ratio of the dormant devices in the on board computing platform (120; 340; 580) increases sequentially.