A method for reading mapping on electronic documents, the method including: showing a text to be read on an electronic display; showing a mouse cursor on the electronic display to be used by a reader as a reading assist; storing on a memory device, in association with the text to be read, a state of the mouse cursor moved by the reader who reads the text, as information reflecting the reader's reading state; showing, on an electronic display, an already read text whose state of the mouse cursor has already been stored on a memory device; and mapping onto the already read text, the stored state of the mouse cursor read out from a memory device, as a trace reflecting the reading state of the previous reading.