The invention provides a prompting apparatus comprising a foldable prompting box which includes two symmetrical opposite walls which can be open and closed, a bottom board which can be folded up and released, and a rear wall, which jointly define a space for housing a two-way see-through mirror and the lens of the camera. The cover defines a space for a user to slide in a tablet device which runs a prompting software application. The pre-designed text is displayed on the tablet device's screen at a speed that the speaker feels comfortable to read. When the apparatus is not in use, the prompting box can be easily folded into a flat compact for the user's convenience to carry.