To solve a fault that a head set also requires charging separately from a cellular phone terminal in the cellular phone terminal having a short range radio communication function as an interface with external equipment separately from a radio part of a cellular phone main body.

The head set B with a short range radio function is constituted so as to be attachable/detachable with the cellular phone main body A, when it is at an attached state, a battery 5 is charged through a charging circuit 9, switches 10, 7 from a charger connected with an external connector 8 and in addition, when the battery 5 is sufficient charged, a head set battery 17 is charged through a set-up circuit 11 by switching the switch 7. Thus, a user can talk over with the head set B using short range radio at any time by only charging a battery of the cellular phone main body A without caring battery running out of the head set B. In the case of detaching the head set B, a power of the head set B is turned on.

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