53. An information access system according to claim 50 wherein the attribute data is constituted by items for which speech has been recognized, and the search means carries out the search from the - phonetic signal information relating to the document corresponding to the attribute data for which the plausibility of the speech recognition results is highest.
50. An information access system according to claim 1 wherein the keyword is attribute data expressing the attributes of the document, a relationship table expressing the relationship between the attribute data and the document corresponding to the attribute data is stored on the database, and the search means executes searches with reference to the relationship table.