A portable-terminal holder for holding a portable terminal that has a
rechargeable battery and a first radio communication device is
constituted by a base and c communication module. The base has a portion
on which the portable terminal is placed, and a charging device for
charging the rechargeable battery of the portable terminal while said
portable terminal is placed on the portion. The communication module has
a second radio communication device communicating with the first radio
communication device for wireless data transmission between the portable
terminal and the communication module, and a cable communication device
communicating with an external host computer for cable data transmission
between the host computer and the communication module. The communication
module is configured to be detachable from the base.