A shipping order allocation apparatus creates a group composed of shipping orders; acquires a time to start picking for the group; acquires blocks where articles included in the group are stored and calculates a total worktime for the picking of the group; determines whether the picking work for the group is completed by the earliest shipping time limit among shipping time limits of the shipping orders in the group, the time to start the picking, and the total worktime for the picking; calculates an evaluation value of the group for which the picking work is determined to be completed by the earliest shipping time limit, based on the blocks storing the articles included in the group; and determines whether to include the group in a result of allocation to groups, based on the evaluation value.