A writing preservation apparatus preserves, as image data, writing on a writing target medium in which writing is performed and erasing of writing in an arbitrary region is performed. The apparatus includes an acquisition unit that acquires time-series image data items at points of times for the writing target medium, a written region recognition unit that recognizes written regions in which writing is performed on the writing target medium at the points of time based on the image data items at the points of time which are acquired by the acquisition unit, and a preservation unit that preserves first image data at a first point of time in a case where the written region recognized based on the first image data in whole or part is absent in the written region recognized based on second image data at a second point of time subsequent to the first point of time.