4. The method of claim 1 , further comprising: estimating an end point candidate location as the end location of the block, based on the second location where the second anchor interaction is input; and displaying one of the second plurality of candidate anchors at the estimated end point candidate location.
4. The method of claim 1 , further comprising: estimating an end point candidate location as the end location of the block, based on the second location where the second anchor interaction is input; and displaying one of the second plurality of candidate anchors at the estimated end point candidate location. 7. The method of claim 4 , wherein displaying the one of the second plurality of candidate anchors at the end point candidate location comprises: displaying the one of the second plurality of candidate anchors at the end point location while the first definite anchor is displayed.