1. A display control apparatus, comprising: a memory; and a central processing unit (CPU) configured to execute instructions stored in the memory, and the CPU is further configured to: search for a plurality of related contents based on a selection of a first symbol that represents a starting content from a plurality of first symbols, wherein the plurality of related contents are related to the starting content based on at least part of first metadata attached to the starting content, and wherein each of the plurality of related contents have attached thereto second metadata identical to the first metadata; generate a three-dimensional display model that includes a first layer and a second layer, wherein: the first layer and the second layer are parallel to each other, the second layer is on top of the first layer and offset with respect to the first layer along a direction perpendicular to the first layer and the second layer, the first layer has arranged therein the first symbol, the second layer has arranged therein a copy of the first symbol and a plurality of second symbols that represent the plurality of related contents, the first symbol comprises at least one of a first image or a first character, and each of the plurality of second symbols comprises at least one of a second image or a second character, and the copy of the first symbol and the selected one of the plurality of second symbols are visually connected with each other in the three-dimensional display model based on a selection of one of the plurality of second symbols to represent a new starting content; and control display of the first symbol, the copy of the first symbol, and the plurality of second symbols based on the three-dimensional display model.