1. A blood cell analyzer comprising: a detector for detecting first and second light information from leukocytes contained in a specimen of a subject; and a controller, including a memory under the control of a processor, the memory storing: correlation information relating to the correlation between inflammation-related marker measurement data and leukocyte distribution data; and instructions enabling the processor to carry out operations, comprising: (a) generating leukocyte distribution data for classifying the leukocytes to subclasses, the leukocyte distribution data including a two dimensional distribution on which the leukocytes in the specimen are plotted according to the detected first and second light information; (b) obtaining the inflammation-related marker measurement data based on the correlation information and the leukocyte distribution data of the subject; and (c) outputting the obtained inflammation-related marker measurement data.