A storage apparatus includes a non-volatile storage device configured to store data; a memory; and a processor coupled to the memory and configured to control access to the non-volatile storage device, the processor configured to: receive an instruction from external software as a task, generate a command set for controlling the non-volatile storage device, execute a command included in the generated command set, control firmware revision processing of the storage apparatus, and stop execution of the command after performing processing for suppressing abnormality detection of the external software at a timing at which the command is not executable during the firmware revision processing.