A processor includes: a first storage that stores data stored in a main storage; a processor that outputs an instruction for loading data from the main storage into the first storage; a second storage that holds a instruction until the first storage receives the data requested by the instruction; a first controller that reads the data requested by an instruction from the first storage and transfers the requested data to the processor, when the requested data is in the first storage, or but, transfers the received instruction to the main storage, when the requested data is not in the first storage and an instruction requesting the same data as the requested data is not in the second storage; and a second controller that completes reading the data requested by an instruction, when an instruction requesting the same data as the requested data is in the second storage.