1. A non-transitory computer-readable medium storing a program causing a computer to execute a process, the process comprising: acquiring a plurality of posted information items, each of the plurality of posted information items including at least either of a text information item and an image information item; generating text information items including a plurality of text items in such a manner that image information items are removed from the plurality of posted information items, and individually classifying the text items included in the text information items into first categories; generating image information items including a plurality of images in such a manner that text information items are removed from the plurality of posted information items, and individually classifying the images included in the image information items into second categories; associating the classified text items and the classified images with each other on the basis of the first and second categories to obtain results; and outputting the text items and the images, which have been associated with each other, for each of the results.