An association method executed by a computer, the association method including obtaining a plurality of images captured by a plurality of cameras, acquiring at least one identifier of at least one radio terminal that is located near one of the plurality of cameras when at least one of the plurality of cameras captures one of the plurality of images, obtaining attributes corresponding to one or more person included in a group of images based on an analysis regarding the group of images, the group of images being included in the plurality of images and corresponding to a first identifier included in the at least one identifier, determining an attribute corresponding to the first identifier based on a result of the obtaining the attributes, and storing, into a storage device, the determined attribute in association with the first identifier.