An article processing apparatus includes: a configuration determination unit configured to determine a configuration of at least one transport unit including articles, and stacked article groups each including a pallet, and at least one of the articles placed on the pallet, wherein the at least one of the articles is placed on the pallet in a manner that allows a pallet of another article group to be placed thereon, excluding uppermost one of the stacked article groups; a palletizing mechanism configured to place the at least one of the articles on the pallet so as to form each of the article groups included in the transport unit whose configuration is determined by the configuration determination unit; and a stacking mechanism configured to stack the article groups formed by the palletizing mechanism so as to form the transport unit determined by the configuration determination unit.