Abstract: A system according to the present invention searches for information related to entered text and presents searched information to a user with a minimum interruption to user's document formulating work. An input analyzing module 11 analyzes text entered by the user and extracts a search key. A related information searching module 12 searches a related information storage device 3 for information on the search key. A storage module 16 stores therein the search results collected for a plurality of past search keys including the latest search key and the positional information on each search key within a document. A controlling module 13 searches the storage module 16 for the search key corresponding to the position of a cursor. The controlling module issues an instruction to change a search button to a first display format if there is no related information, or an instruction to change the search button to a second display format if there is related information.

Abstract: A support information and spelling variation display set-up section serves for setting up in advance a plurarity of kinds of spelling variations such as of conjugations respectively for conversion result candidates as well as a plurality of kinds of support information that a user may desire to reference for the conversion result candidates, cooperating with a support information and spelling variation display direction unit, which accepts a command for designating a kind of support information or a kind of spelling variation and a command for directing a display thereof, and a conversion result selection and decision unit, which accepts a command for a direction of a selection and a decision of a conversion result, permitting the user to voluntarily reference one of the support information and the spelling variations for a plurality of candidates, any time when desired, effectively reducing a burden to reference a dictionary in preparation of a sentence.