To solve the problem that since a writing surface has a limit in the number of pages in an electronic blackboard having a recording head for recording on a rewritable recording medium, an erasing head for erasing a content recorded by the recording head, a CPU, a memory and a controller, at the time of using many pages or using for arrangements of several times, when the writing surface is erased, an addition cannot be filled in the page later.

The electronic blackboard comprises the rewritable recording medium, a transparent resin sheet superposed on the medium so that the medium and the resin sheet can be independently conveyed, and an image reading sensor for reading the content written on the resin sheet.