Disclosed is a method for assigning and scheduling a task for maximizing video quality of a transcoding server using heterogeneous processors. A method performed by a transcoding server configured with heterogeneous processors may include receiving a request for video transcoding for a video encoded based on a variable bitrate (VBR), predicting transcoding information for assigning a transcoding task in response to the received request for video transcoding, and determining information on a node to which a transcoding task is to be assigned and preset option information for the transcoding based on a result of the predicted transcoding information.