Embodiments of the present invention relate to dividing and merging documents on a touch panel. A method includes dividing a document displayed on a touch panel having a display function using an information processing device connected to the touch panel. Positions of two different points on the touch panel are identified in response to a user indicating the two different points in the document. The document is divided, by a computer processor, based on a line segment extending from a starting point to an end point of a traced line traced by the user. The line segment is used as a dividing line in response to the user tracing the traced line on the touch panel so as to traverse the two different points.