1. A searching apparatus comprising: a memory configured to store therein one or more image data of which each includes respectively one or more cooperative object, and one or more pieces of cooperative information associated with one cooperative object; and a processor configured to, receive a captured image including a captured object that is a capturing target of a user, search for, out of the image data, an image data that includes the same object as the captured object included in the received captured image, determine, when a plurality of image data that includes the same object as the captured object have been searched for, a priority among a plurality of the searched image data based on a first ratio of a size of the captured object with respect to a size of the received captured image, present the cooperative information associated with the cooperative object included in at least one of the plurality of the searched image data that includes the same object as the captured object based on the determined priority, extract the captured object from the received captured image, determine the first ratio based on the size of extracted captured object and the received captured image, and determine the priority among the plurality of the searched image data based on a relation between the first ratio and a second ratio of a size of the same object included in one of the plurality of the searched image data with respect to a size of the one of the plurality of the searched image data.