A reporting method includes: obtaining an address that is assigned to a target device and that is included in a control signal used for a communication with an access point in a plurality of access points; storing identification information in a storage in association with the address of the target device; storing, when receiving report destination information, the report destination information in the storage in association with the address of the target device if identification information reported in association with the report destination information is stored in the storage; referring to the storage when obtaining information of a control signal received by one of the plurality of access points; and reporting, when a source address of the control signal exists in the storage, to a report destination stored in association with the source address that there is an access from the target device.
