A method and an apparatus for processing a picture of an instant messenger are disclosed, which belong to the field of computers comprising: obtaining related information of an edit region, wherein the related information comprises at least a horizontal coordinate range and a vertical coordinate range; obtaining and recording position information of an initial cursor when a start notice is received, wherein the position information comprises at least coordinates; and obtaining position information of a current cursor in real time, generating a line segment according to the position information of the current cursor, the recorded position information and the related information, and updating the recorded position information into the position information of the current cursor. The apparatus comprises a first obtaining module, a second obtaining module and a generation module. The present disclosure can draw a line according to the movement path of the cursor.