A device management system including a state detection unit, an input unit, and a state determination unit, wherein the state detection unit configured to detect a state of each steam controller in a plant of interest; the input unit configured to input detection information (σi) from the state detection unit, the input detection information (σi) including detection values (di) and device identification information (ti); and the state determination unit configured to effect determination of whether the state of a target steam controller is normal or not based on the detection information (σi) inputted to the input unit; for each steam controller in the plant of interest, device identification information (ti) for identifying the each steam controller being set; the state detection unit being configured to input the detection information (σi) including the corresponding device identification information (ti) to the input unit; characterized in that the device management system comprises: a storage unit which stores, in correlation with the device identification information (ti) set in each steam controller, location information (Li) indicating a location of each steam controller in the plant of interest, the storage unit further storing work patterns (Wi) for the steam controller according to a classification based on a device type (tai) and an installation state (tbi) of the steam controller; a data extraction unit configured to extract from the storage unit the location information (Li) based on the device identification information (ti) inputted to the input unit and to extract also a corresponding work pattern (Wi) based on the device type (tai) and the installation state (tbi) specified from the device identification information (ti) inputted to the input unit, for a work-target device comprised of a steam controller whose state is determined as being not normal by the state determination unit; and a work information generation unit configured to generate work information consisting of the extracted location information (Li) and work pattern (Wi) for the work-target device. a storage unit which stores, in correlation with the device identification information (ti) set in each steam controller, location information (Li) indicating a location of each steam controller in the plant of interest, the storage unit further storing work patterns (Wi) for the steam controller according to a classification based on a device type (tai) and an installation state (tbi) of the steam controller; a data extraction unit configured to extract from the storage unit the location information (Li) based on the device identification information (ti) inputted to the input unit and to extract also a corresponding work pattern (Wi) based on the device type (tai) and the installation state (tbi) specified from the device identification information (ti) inputted to the input unit, for a work-target device comprised of a steam controller whose state is determined as being not normal by the state determination unit; and a work information generation unit configured to generate work information consisting of the extracted location information (Li) and work pattern (Wi) for the work-target device.