A document processing apparatus includes a comparison source data acquisition unit that acquires a plurality of comparison source data each including a plurality of comparison source descriptions that are acquired from a comparison source document and ordered; a comparison target acquisition unit that acquires one or more comparison target data respectively acquired from comparison target documents; and a comparison result output unit that outputs a comparison result based on a minimum difference between one datum of the comparison source data and one data of the comparison target data corresponding to one of a plurality of combinations in each of which one of the comparison source data is combined with one of the comparison target data.