1. A word composing apparatus comprising: a dictionary storing at least words and parts of speech corresponding to the words; a search condition designator that designates a part of speech from a plurality of parts of speech as a search condition, said parts of speech including at least a class of nouns and verbs; a word search unit that searches for one or more words matching the search condition designated by said search condition designator from said dictionary; a display unit that displays one or more words that match the search condition; and an input processor that selects one of the one or more words displayed that match the search condition and executes a process of inputting the selected word displayed on said display unit as letters or characters of a song word.