A character string selection detector may detect selection of a character string appearing on a screen of a display in accordance with an application program. The selection may be performed with an operation with an input device. A registration screen controller may cause a word registration screen for registering, to a dictionary, the character string selected and detected by the character string selection detector to appear on the display in response to a registration operation detector detecting a registration operation. A word registration unit may register, to the dictionary, a word in accordance with data appearing on the word registration screen in response to an enter operation detector detecting an enter operation.