A VLIW (Very Long Instruction Word) interface device includes a memory configured to store instructions and data, and a processor configured to process the instructions and the data, wherein the processor includes an instruction fetcher configured to output an instruction fetch request to load the instruction from the memory, a decoder configured to decode the instruction loaded on the instruction fetcher, an arithmetic logic unit (ALU) configured to perform an operation function if the decoded instruction is an operation instruction, a memory interface scheduler configured to schedule the instruction fetch request or a data fetch request that is input from the arithmetic logic unit, and a memory operator configured to perform a memory access operation in accordance with the scheduled instruction fetch request or data fetch request.