the multiple liquid chromatographs each of which comprises a separation column to receive a sample and separate the received same into components;

a detector to detect the components of the sample fed from each of the multiple liquid chromatographs;

a data processing unit to process detection data detected by the detector; a device control unit to control the multiple liquid chromatographs and the detector; and

an output unit,

wherein the device control unit judges a device status of the multiple liquid chromatographs in accordance with data that is obtained by detecting a measurement object sample and a non-retaining ingredient sample introduced into any one of the multiple liquid chromatographs by the detector and that is processed by the data processing unit;

wherein the device control unit judges a device status of the multiple liquid chromatographs on the basis of peak separation performance of the measurement object sample and fluctuation of retention time of the non-retaining ingredient sample;

wherein the device control unit judges whether or not peak separation performance of the measurement object sample is within a peak separation allowable range, outputs a separation column replacement instruction to the output unit when fluctuation of retention time of the non-retaining ingredient sample is within a fluctuation allowable range, and outputs a device maintenance instruction to the output unit when the peak separation performance is not within the peak separation allowable range and the fluctuation of the retention time of the non-retaining ingredient sample is not within the fluctuation allowable range.