An information processing device and information processing method with improved error tolerance are implemented. There is included a data processing unit that executes lockstep processing in which a plurality of processing systems executes the same task and error verification is performed by comparing execution results. In a case where an error is detected in the lockstep processing, the data processing unit increases supply voltage to a CPU circuit system that executes the task, processing of lowering a supply clock, or the like, as control for improving noise tolerance of the CPU circuit system, and moreover, performs re-execution processing of the task by using more processing systems than the processing systems before the error detection.