A collection unit collects the identification information on each terminal apparatus and the remaining amount information on a remaining amount of battery by having each terminal apparatus mutually communicate the identification information on each terminal apparatus and the remaining amount information on the remaining amount of battery by way of a second communication unit. The collection unit also collects the identification information on its own terminal apparatus and the remaining amount information on the remaining amount of battery of the own terminal apparatus. A selector selects a single terminal apparatus, based on the remaining amount information collected. When the selector selects the own terminal apparatus, the positional information on the own terminal is acquired and the acquired positional information and the identification information collected by the collection unit are transmitted by the first communication unit to the base station apparatus.