1. An instruction control device having instruction storing means for temporarily storing a plurality of decoded instructions yet unissued to an execution unit; wherein said storing means is constituted such that an arranged order of entries of said storing means indicates a decoded order of decoded instructions stored in said entries; wherein that entry, from which the decoded instruction stored therein has been issued, is deleted; wherein informations stored in said entries are shifted among said entries such that said entries storing said unissued instructions constitute entries in a continuous order; and wherein a shifting amount between entries is at the utmost equal to the number of instructions which can be simultaneously decoded.