A selection method for selecting content includes the steps of: (a) receiving a first touch point triggered, the first touch point sliding to a second touch point along a first moving track, and recording the first moving track; (b) determining whether the first touching object has left the touch screen; (c) while Step (b) is negative, allowing to receive a third touch point triggered by a second touching object, the third touch point sliding to a fourth touch point along a second moving track, and recording the second moving track; (d) determining whether both the first touching object and the second touching object have left the touch screen; and (e) while Step (d) is positive, basing on the first moving track and the second moving track to simultaneously select and label a first and a second contents of the document corresponding to the first and the second moving tracks, respectively.