An information processing device for examining images taken from a biological sample, the information processing device comprising: a categorizing section configured to: receive a plurality of images obtained by imaging a sample fluid using a camera whilst the sample fluid is flowing through a flow cell, the sample fluid containing a plurality of types of material components; identify, from the plurality of images, a material component image set; extract, from the plurality of images, the identified material component images; and categorize the extracted material component images into predetermined categories, wherein the categorization is by at least one of: type, size, shape of material components, or presence of a nucleus; a storage section configured to store the extracted material component images categorized by the categorizing section; a count derivation section configured to compute a count of the material component in a visual field dependent on a magnification ratio, or compute a count per unit liquid volume of the material component contained in the flowing sample fluid, for each predetermined category based on the number of material component images categorized by the categorizing section; a generation section configured to generate an image in which stored material component images are displayed, the displayed material component images being arranged such that they do not overlap with each other, and in numbers according to the counts that have been computed by the count derivation section for each predetermined category, in an area corresponding to the visual field; and a setting section configured to set an upper limit, for each of the categories, for a number of the material component images among the material component images that have been categorized by the categorizing section, to be stored in the storage section; wherein the upper limit number of material component images stored is adjustable by category of material component; and wherein the generation section is configured to duplicate material component images stored in the storage section in a case in which a number of material component images for each predetermined category to be displayed as part of the generated image exceeds the upper limit so as to acquire material component images for the amount by which the upper limit is exceeded. a categorizing section configured to: receive a plurality of images obtained by imaging a sample fluid using a camera whilst the sample fluid is flowing through a flow cell, the sample fluid containing a plurality of types of material components; identify, from the plurality of images, a material component image set; extract, from the plurality of images, the identified material component images; and categorize the extracted material component images into predetermined categories, wherein the categorization is by at least one of: type, size, shape of material components, or presence of a nucleus; receive a plurality of images obtained by imaging a sample fluid using a camera whilst the sample fluid is flowing through a flow cell, the sample fluid containing a plurality of types of material components; identify, from the plurality of images, a material component image set; extract, from the plurality of images, the identified material component images; and categorize the extracted material component images into predetermined categories, wherein the categorization is by at least one of: type, size, shape of material components, or presence of a nucleus; a storage section configured to store the extracted material component images categorized by the categorizing section; a count derivation section configured to compute a count of the material component in a visual field dependent on a magnification ratio, or compute a count per unit liquid volume of the material component contained in the flowing sample fluid, for each predetermined category based on the number of material component images categorized by the categorizing section; a generation section configured to generate an image in which stored material component images are displayed, the displayed material component images being arranged such that they do not overlap with each other, and in numbers according to the counts that have been computed by the count derivation section for each predetermined category, in an area corresponding to the visual field; and a setting section configured to set an upper limit, for each of the categories, for a number of the material component images among the material component images that have been categorized by the categorizing section, to be stored in the storage section; wherein the upper limit number of material component images stored is adjustable by category of material component; and wherein the generation section is configured to duplicate material component images stored in the storage section in a case in which a number of material component images for each predetermined category to be displayed as part of the generated image exceeds the upper limit so as to acquire material component images for the amount by which the upper limit is exceeded.