A program stored in a non-transitory computer-readable medium causes an image processing apparatus to execute: read image data acquisition processing of acquiring read image data which is generated by optically reading a document and represents a read image including the document; line identification processing of identifying candidate lines which are candidates of lines representing edges of the document through analysis of the read image; and document information identification processing of identifying document information including at least one of a candidate line which represents at least a part of the edges of the document in the read image and an inclination of the document relative to the read image, by using a reference line formed from at least one of the candidate lines identified.