Abstract: The present invention provides a method of taking notes in reading an article displayed in an electronic book. Said method comprises: (a) highlighting a character string of an article displayed on a display of an electronic book; (b) opening a note window on the display; (c) writing on a panel of the display or speaking to the electronic book, so that the written or spoken text is displayed in the note window by recognizing the input text with a computer program stored in said electronic book, and thus a note is made; and (d) recording said marked character string and said note in a functional relationship in a nonvolatile memory of said electronic book.