A method for displaying a chromatogram, wherein the chromatogram comprises a time axis and an axis corresponding to the detection output, wherein a plurality of measurement target components appear as a plurality of peaks in the chromatogram, the method comprising: a step of determining a display form of the chromatogram, including reading priority information indicating priority levels of the measurement target components and determining a highest priority measurement target component having the highest priority level, and determining the display form based on the priority levels of the measurement target components; and a step of displaying the chromatogram in the determined display form, characterized in that the step of determining the display form includes: determining a peak area of the highest priority measurement target component; determining a sum of peak areas, wherein the sum of peak areas is either a sum of the peak areas of all measurement target components or a sum of peak areas of specific measurement target components; determining a component ratio, wherein the component ratio is the ratio of the peak area of the highest priority measurement target component to the sum of peak areas; and determining the display gain so that a ratio of the height of the peak of the highest priority measurement target component to the length of the output axis of the chromatogram is equal to the component ratio, whereby the height of the peak of the highest priority measurement target component corresponds to the component ratio, whereby the peak of the highest priority measurement target component is displayed more preferentially. a step of determining a display form of the chromatogram, including reading priority information indicating priority levels of the measurement target components and determining a highest priority measurement target component having the highest priority level, and determining the display form based on the priority levels of the measurement target components; and a step of displaying the chromatogram in the determined display form, characterized in that the step of determining the display form includes: determining a peak area of the highest priority measurement target component; determining a sum of peak areas, wherein the sum of peak areas is either a sum of the peak areas of all measurement target components or a sum of peak areas of specific measurement target components; determining a component ratio, wherein the component ratio is the ratio of the peak area of the highest priority measurement target component to the sum of peak areas; and determining the display gain so that a ratio of the height of the peak of the highest priority measurement target component to the length of the output axis of the chromatogram is equal to the component ratio, whereby the height of the peak of the highest priority measurement target component corresponds to the component ratio, whereby the peak of the highest priority measurement target component is displayed more preferentially. determining a peak area of the highest priority measurement target component; determining a sum of peak areas, wherein the sum of peak areas is either a sum of the peak areas of all measurement target components or a sum of peak areas of specific measurement target components; determining a component ratio, wherein the component ratio is the ratio of the peak area of the highest priority measurement target component to the sum of peak areas; and determining the display gain so that a ratio of the height of the peak of the highest priority measurement target component to the length of the output axis of the chromatogram is equal to the component ratio, whereby the height of the peak of the highest priority measurement target component corresponds to the component ratio, whereby the peak of the highest priority measurement target component is displayed more preferentially.