A method for controlling a variable lane provided at an intersection with a traffic light, a direction of the variable lane being indicated by a guide arrow in an indication sign mounted above the variable lane, comprising: acquiring (101, 201, 301) first traffic data for a first driving direction corresponding to the variable lane and second traffic data for a second driving direction of a lane adjacent to the variable lane; determining (102, 202, 302) a first saturation in the first driving direction based on the first traffic data and determining a second saturation in the second driving direction based on the second traffic data; determining (103, 203, 303) an imbalance coefficient between the first driving direction and the second driving direction based on the first saturation and the second saturation; and controlling (104, 304) a driving direction of the variable lane based on the imbalance coefficient; characterized in that, determining the first saturation in the first driving direction and the second saturation in the second driving direction comprises: determining the first saturation based on a green light duration, a waste duration, a red light queue length, and a saturated time headway in each signal period comprised in the first traffic data for the first driving direction; and determining the second saturation based on a green light duration, a waste duration, a red light queue length, and a saturated time headway in each signal period comprised in the second traffic data for the second driving direction, wherein the first saturation represents a ratio of an actual traffic flow of the variable lane to a saturated traffic flow of the variable lane, and the second saturation represents a ratio of an actual traffic flow of the lane adjacent to the variable lane to a saturated traffic flow of the lane adjacent to the variable lane. acquiring (101, 201, 301) first traffic data for a first driving direction corresponding to the variable lane and second traffic data for a second driving direction of a lane adjacent to the variable lane; determining (102, 202, 302) a first saturation in the first driving direction based on the first traffic data and determining a second saturation in the second driving direction based on the second traffic data; determining (103, 203, 303) an imbalance coefficient between the first driving direction and the second driving direction based on the first saturation and the second saturation; and controlling (104, 304) a driving direction of the variable lane based on the imbalance coefficient; characterized in that, determining the first saturation in the first driving direction and the second saturation in the second driving direction comprises: determining the first saturation based on a green light duration, a waste duration, a red light queue length, and a saturated time headway in each signal period comprised in the first traffic data for the first driving direction; and determining the second saturation based on a green light duration, a waste duration, a red light queue length, and a saturated time headway in each signal period comprised in the second traffic data for the second driving direction, wherein the first saturation represents a ratio of an actual traffic flow of the variable lane to a saturated traffic flow of the variable lane, and the second saturation represents a ratio of an actual traffic flow of the lane adjacent to the variable lane to a saturated traffic flow of the lane adjacent to the variable lane. determining the first saturation based on a green light duration, a waste duration, a red light queue length, and a saturated time headway in each signal period comprised in the first traffic data for the first driving direction; and determining the second saturation based on a green light duration, a waste duration, a red light queue length, and a saturated time headway in each signal period comprised in the second traffic data for the second driving direction, wherein the first saturation represents a ratio of an actual traffic flow of the variable lane to a saturated traffic flow of the variable lane, and the second saturation represents a ratio of an actual traffic flow of the lane adjacent to the variable lane to a saturated traffic flow of the lane adjacent to the variable lane.