A communication processing apparatus (101) includes: a MAC unit (106) receiving a packet; a classification unit (107) classifying the received packet; a transfer control unit (104) transferring data of the classified packet to a main memory (102); a first memory (112m) storing an interrupt management table (112); an interrupt control unit (111) specifying, with reference to the interrupt management table (112), an interrupt control method associated with the classification of the packet classified by the classification unit (107) and outputting an interrupt signal to a CPU (103) using the specified interrupt control method; and a setting unit (110) registering the classification and the interrupt control method into the interrupt management table (112) according to instructions from an application program activated in the CPU (103) so as to update the interrupt management table (112).