1. An image information processing apparatus comprising: a non-transitory memory that stores a program; and a processor that executes the program and causes the image information processing apparatus to operate as: an extraction unit that extracts one or more objects from a photographed image; a calculation unit that calculates, according to information pertaining to each of the one or more objects, an attention vector indicating attention in a photographed scene appearing in the image; and a provision unit that provides, to the image, a tag indicating a classification to which the image belongs according to a direction of the attention vector and a magnitude of the attention vector, wherein the calculation unit calculates a proportion of the image occupied by each of the one or more objects, the proportion of the image occupied being expressed as a percentage value, calculates, for each of the one or more objects, a vector having a direction corresponding to a direction of attention of a corresponding object in the image and a magnitude corresponding to the proportion of the image occupied by a corresponding object, and calculates the attention vector by using the one or more vectors corresponding to the one or more objects.