1. An assisting apparatus that assists in a task for generating task-completed data from original data, the assisting apparatus comprising: a conversion unit that converts the original data into converted data 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 to the operator, and thereby allows the operator to perform the task by using the converted data and thus to generate a task-completed version of the converted data; and an inverse conversion unit that generates the task-completed data by performing inverse conversion of the task-completed version of the converted data.