INFORMATION PROCESSING DEVICE, METHOD AND COMPUTER PROGRAM PRODUCT

According to an embodiment, a memory controller stores, in a memory, character strings in voice text obtained through voice recognition on voice data, a node index, a recognition score, and a voice index. A detector detects reproduction section of the voice data. An obtainer obtains reading of a phrase in a text written down from the reproduced voice data, and obtains insertion position of character strings. A searcher searches for a character string including the reading. A determiner determines whether to perform display based on the recognition score corresponding to the retrieved character string. A history updater stores, in a memory, candidate history data indicating the retrieved character string, the recognition score, and the character insertion position. A threshold updater decides on a display threshold value using the recognition score of the candidate history data and/or the recognition score of the character string selected by a selector.