A central device, comprising: a CPU including a receiving section a storing processing section, an abnormality determining section and a generating section; characterized in that the central device is connectable to at least one terminal device provided in each of a plurality of plants via a communication network, the receiving section is adapted to receive plant identification information to identify a plant, machine identification information to identify each textile machine of a plurality of textile machines connected to the terminal device, unit identification information to identify each unit of a plurality of units of the textile machine, and a plurality of operation information elements on operating states of the textile machines and the units, the storing processing section is adapted to store the plurality of operation information elements received by the receiving section in a storing section in association with the plant identification information, the machine identification information, and the unit identification information, the abnormality determining section is adapted to determine that an operation information element indicates an abnormal operation of a textile machine or a unit when a value associated with the operation information element stored in the storing section exceeds a threshold, the generating section is adapted to generate report information per plant identification information, including operation information elements of each of the textile machines and the units and abnormality information determined by the abnormality determining section, and the CPU is configured to - refer to an evaluation value file to sort average evaluation values, each associated to a plant ID, and ranks the plants by their ID, - read out a threshold rank from a storing section, whereas when a plant is ranked equal or below said threshold rank, the CPU refers to an action file for evaluation values and read out actions to be taken by an user to use the textile machines of the plant more efficiently, and write the actions to the report information. a CPU including a receiving section a storing processing section, an abnormality determining section and a generating section; the central device is connectable to at least one terminal device provided in each of a plurality of plants via a communication network, the receiving section is adapted to receive plant identification information to identify a plant, machine identification information to identify each textile machine of a plurality of textile machines connected to the terminal device, unit identification information to identify each unit of a plurality of units of the textile machine, and a plurality of operation information elements on operating states of the textile machines and the units, the storing processing section is adapted to store the plurality of operation information elements received by the receiving section in a storing section in association with the plant identification information, the machine identification information, and the unit identification information, the abnormality determining section is adapted to determine that an operation information element indicates an abnormal operation of a textile machine or a unit when a value associated with the operation information element stored in the storing section exceeds a threshold, the generating section is adapted to generate report information per plant identification information, including operation information elements of each of the textile machines and the units and abnormality information determined by the abnormality determining section, and the CPU is configured to - refer to an evaluation value file to sort average evaluation values, each associated to a plant ID, and ranks the plants by their ID, - refer to an evaluation value file to sort average evaluation values, each associated to a plant ID, and ranks the plants by their ID, - read out a threshold rank from a storing section, whereas when a plant is ranked equal or below said threshold rank, the CPU refers to an action file for evaluation values and read out actions to be taken by an user to use the textile machines of the plant more efficiently, and write the actions to the report information. write the actions to the report information.