Abstract: An image forming apparatus includes a data input unit, an instruction input unit, an image forming unit, a display unit, and a controller. The controller causes the display unit to display, when first document data is received through the data input unit, and character strings expressed by the first document data include a first character string containing a misspelling, a second character string that may possibly be substituted for the first character string. The controller also generates, upon receipt of an instruction to select the second character string through the instruction input unit, second document data on a basis of the first document data, by substituting the first character string in the character strings expressed by the first document data, with the second character string selected.