A command retry control apparatus, for use with an information processor which executes a program under pipeline control, translates an instruction contained in the program into commands in a processable form and executes the processing on a command basis. The command retry control apparatus determines (405), if an error occurs during the execution of the command, whether or not an operand value is a normal value and executes (408), when the operand value is the normal value, a command retry by stopping inputting a next command. The command retry control apparatus continues the processing by resuming (410, 411) the inputting of the next command when normally finishing the command retry. If the error reoccurs in the middle of the command retry, the command retry control apparatus decides (412) that the command is inexecutable and notifies (413) a management system of the occurrence of error.;Such apparatus can enhance the applied range of a retry function in the pipeline control program of the information processor, thereby improving a reliability, an availability and a serviceability of the information processor.
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