Data processing apparatus and method for simultaneously executing plural instructions

A data processing apparatus includes a plurality of execution units (221 to 224) for executing a plurality of instructions fetched from a cache memory (15) or an instruction memory (11), at a same time. Then, in case of a cache miss-hit in an instruction fetch, a hazard detector (16) detects an executable instruction from the plurality of instructions fetched from the instruction memory (11), and generates a tag data, and then sends an instruction selected based on the tag data to the execution unit (221 to 224), and also stores the generated tag data and the plurality of fetched instructions in the cache memory (15). On the other hand, at a time of a miss-hit, it sends to the execution unit (221 to 224) an instruction selected in accordance with the tag data stored in the cache memory (15), from the plurality of instructions stored in the cache memory (15). Thus, it is possible to provide the data processing apparatus and the data processing method that can treat all instructions including a branch instruction at a high speed, irrespectively of a small hardware.