To provide a cellulating device with which time for transferring frame data and additional information to be applied to the cellulating device in the case of cellulation can be shortened without using any high-speed CPU and DMA controller.

For the unit of cell data, the frame data inputted from a frame data input part 131 are successively stored into the unit buffer(UB) of empty queue 125 chain-connecting plural UB for storing data for a prescribed length corresponding to cells. Next, the UB storing the cell data of empty queue 125 is suitably connected to the end of unit buffers of queues 121, 122 and 123 for each connection corresponding to the connection shown by connection information, the cell data are successively extracted from the leading unit buffers of these queues 121, 122 and 123 for each connection and cellulated, and these cellulated cells are sent out at speed independent for each connection.