A memory control apparatus and a memory control method are provided to enable an effective utilization of buffer memory in a system LSI by comprising buffer memory for temporarily storing data stored in memory, and comprising the processes of: receiving an instruction to the memory; transmitting a buffer memory security-dedicated use packet for securing the capacity of memory in the buffer memory required by the instruction on the basis of the received instruction; receiving a buffer memory validation signal corresponding to the transmitted buffer memory security-dedicated use packet; and executing the received instruction on the basis of the received buffer memory validation signal.