According to an embodiment, a communication apparatus acquires tag data of each wireless tag at a plurality of positions of a moved antenna via an antenna. The communication apparatus inputs the tag data of each wireless tag into a learned model selected from a plurality of learned models in a manner that depends on an environment of the apparatus. In addition, the communication apparatus acquires, on the basis of input of the tag data of each wireless tag into the learned model, data indicating a range in which each wireless tag is present from the learned model.