A device with quality controllable SAR function according to upper layer instruction enables reassembly and segmentation SAR of AAL5 to which priority in upper layer is reflected to be provided in reassembly and segmentation of AAL5 in ATM layer processing. This device is provided with a frame storage unit for executing reassembly of a frame of AAL5 (ATM Adaptation Layer Type 5) from an ATM (Asynchronous Transfer Mode) cell, an identification adder for receiving a cell stream through a cell reassembly processor, and for adding an identifier on a basis of cell header information in order to introduce the cell which the frame storage unit receives therein into the frame storage unit or on the basis of upper layer information within a cell payload, a cell reassembly unit for assembling the cell received by the cell reassembly processor, a next processing decision unit having a second priority part for deciding either sending or abolition of the frame concerned on the basis of the received header on the occasion of sending the frame obtained from the cell received according to the cell reassembly processor and/or on the basis of the upper layer information within the payload, a storage unit for storing therein an inputted transmission frame, and a selector for selecting the transmission frame sent from the storage unit.
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