The data received in the communication channel 12 is stored in the data area 200. The list area 202 corresponds to the data area 200 and the communication data is deleted from the empty list management area 204 and added to the logical check list management area 206. [ The list area 202 corresponding to the data area 200 logically checked by the lower layer logic checker 40 is deleted from the logical check list management area 206 and added to the upper layer protocol sort list management area 208. [ The list area 202 corresponding to the data area 200 classified by the upper layer protocol sort processing part 42 is added to the empty list area 204. [ When data related to a protocol with an OSI model is processed, the transfer of the actual data in the data storage is not required.
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