The invention provides an alarm information processing device and an alarm information processing method capable of verifying an information processing operation on the basis of alarm data with ease. An information processing means fetches the alarm data of a plant, and executes a predetermined information processing. A storage means stores the alarm data of the plant. A data generation means generates a testing alarm data for testing the operation of the information processing means in accordance with a user's operation. An operation reproduction means executes the same operation as the information processing means on the basis of the testing alarm data generated by the data generation means. An algorithm setting means defines an operation algorithm of the information processing means 51 in accordance with the user's operation.