A management device includes a receiving unit, a judgment unit, a permission unit and a change unit. The permission unit permits the image forming device to perform a requested image forming processes, if the judgment unit judges that a number of image forming process which have been performed is within a first upper limit value. The change unit sets, if the number of image forming process which have been performed exceeds the first upper limit value through the requested and permitted image forming processes being performed, a second upper limit value used for limiting image forming processes at the next time based on an excess amount from the first upper limit value.