A document processing apparatus includes a display unit for visually displaying a character train, a generating unit for generating display position information on the display unit on the basis of visualization position information corresponding to a character pitch of a visualizing unit having a resolution different from that of the display unit, a detecting unit for detecting a punctuation in the character train, and a control unit for controlling the generating unit to perform matching between the position information caused by a difference between the resolutions on the basis of punctuation detection performed by the detecting unit.