1. An assisting apparatus that assists in a task for generating task-completed data from original data with audio or text, the assisting apparatus comprising: a conversion unit that converts the original data with audio or text into converted data with audio or text in order to keep a content of the original data secret from an operator in charge of the task; an interface unit that provides the converted data with audio or text to the operator, and thereby allows the operator to perform the task by using the converted data with audio or text and thus to generate a task-completed version of the converted data with audio or text, said operator generating a task-completed version of the converted data with text on the basis of the audio of the converted data; and an inverse conversion unit that generates the task-completed data with text by performing inverse conversion of the task-completed version of the converted data with text, and a speech recognition unit that generates a speech recognition text by recognizing audio of the original data, wherein the conversion unit converting the original data and a speech recognition text of the original data into the converted data and a speech recognition text of the converted data, and the interface unit providing the converted data and the speech recognition text of the converted data to the operator, thereby allowing the operator to edit the speech recognition text of the converted data and to generate a transcription corresponding to audio of the converted data, the conversion unit further generating the converted data and the speech recognition text of the converted data by inserting different audio and a different text into at least one section of the audio of the original data and at least one section of the speech recognition text of the original data, respectively, the inverse conversion unit generating the task-completed data by removing the sections corresponding to the different audio and text from the task-completed version of the converted data.