A keyword input supporting apparatus includes a document acquisition unit that acquires a document having a plurality of components containing text data, a main component selection unit that selects a component having many characters in the text data as a main component, a part-of-speech analysis unit that analyzes the part-of-speech of the text data contained in the main component, and adds a semantic attribute to each of words of the text data, a specific name extraction unit that extracts as a specific name a word, having a predetermined semantic attribute or part of speech, from the words, a specific name storage that stores the specific name together with the corresponding semantic attribute, a keyword candidate classification unit that performs classification of the specific name from the storage as a keyword candidate based on the semantic attribute, and a keyword candidate presentation unit that presents the keyword candidate to a user.