1. An information processing device, comprising: one or more processors configured to: create an event cluster including photo content and social content of a social networking service, wherein each of the social content and the photo content are associated with a first event; create meta information associated with the first event based on at least one of the photo content or the social content, wherein the meta information comprises event title information indicating a title of the first event, event generation period information indicating a period in which the first event occurred, event generation place information indicating a place where the first event occurred, event main-character information indicating a main character of the first event, or event attribute information indicating an attribute of the first event; append the meta information to the event cluster to generate first information; and control transmission of the first information to a user terminal.