Abstract: A labeling method includes determining whether there is an intersection between the first annotated segment and the second annotated segment; if Yes, determining whether the first annotated segment and the second annotated segment have different labels from each other; if Yes, sending the label of the first annotated segment to the second agent unit and the label of the second annotated segment to the first agent unit; if No, determining whether a discrepancy-over-union ratio between the first annotated segment and the second annotated segment is below a first threshold; if Yes, determining the intersection of the first annotated segment and the second annotated segment as a final annotated segment for the piece of time-series data; if No, assigning a review tag to a union segment of the piece of time-series data which has a duration from a start of the first annotated segment to an end of the second annotated segment.