Ntt Docomo, Inc.

Yusuke Saito

Kohei Sato

Hideyuki Nagasawa

To provide a mobile terminal apparatus capable of suppressing exhaustion of the battery while securing convenience of switching to a communication system corresponding to an existing area, and a control method and communication system for the apparatus, a mobile terminal apparatusis driven by power supply from a battery, capable of communicating with each of a plurality of communication systems, monitors a communication environment with each of the communication systems, and has a detecting section that detects a battery remaining amount of the battery, and a control sectionthat limits targets to monitor when the battery remaining amount falls below a first threshold.

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Kawasaki, Japan

Yusuke Saito