A disconnector control device for an electric vehicle, comprising: a disconnector configured to switch wheel driving manners; and a processor configured to detect a driving condition of the vehicle, acquire at least one factor related to operation of the disconnector, and operate the disconnector based on the acquired at least one factor, characterised in that: the processor is configured to: acquire a road surface slope, regenerative braking torque, and a difference in wheel speed between a front wheel and a rear wheel using at least one of a navigation device and a sensing device when the driving condition is the downhill driving condition, and determine a score for each of the road surface slope, the regenerative braking torque, and the difference in the wheel speed between the front wheel and the rear wheel by referring to a score calculation reference table stored in a memory, calculate a first operation score by summing up scores for the road surface slope, the regenerative braking torque, and the difference in the wheel speed between the front wheel and the rear wheel, and engage the disconnector in response to determining that the calculated first operation score is greater than or equal to a first reference score. a disconnector configured to switch wheel driving manners; and a processor configured to detect a driving condition of the vehicle, acquire at least one factor related to operation of the disconnector, and operate the disconnector based on the acquired at least one factor, characterised in that: the processor is configured to: acquire a road surface slope, regenerative braking torque, and a difference in wheel speed between a front wheel and a rear wheel using at least one of a navigation device and a sensing device when the driving condition is the downhill driving condition, and determine a score for each of the road surface slope, the regenerative braking torque, and the difference in the wheel speed between the front wheel and the rear wheel by referring to a score calculation reference table stored in a memory, calculate a first operation score by summing up scores for the road surface slope, the regenerative braking torque, and the difference in the wheel speed between the front wheel and the rear wheel, and engage the disconnector in response to determining that the calculated first operation score is greater than or equal to a first reference score. acquire a road surface slope, regenerative braking torque, and a difference in wheel speed between a front wheel and a rear wheel using at least one of a navigation device and a sensing device when the driving condition is the downhill driving condition, and determine a score for each of the road surface slope, the regenerative braking torque, and the difference in the wheel speed between the front wheel and the rear wheel by referring to a score calculation reference table stored in a memory, calculate a first operation score by summing up scores for the road surface slope, the regenerative braking torque, and the difference in the wheel speed between the front wheel and the rear wheel, and engage the disconnector in response to determining that the calculated first operation score is greater than or equal to a first reference score.