Sony Corporation

Sony Electronics Inc

Sony Corporation of America

Ichiro Hino

James E Wicks

Katsumi Hirota

Hirokazu Takagaki

Shinji Okazaki

Koichi Matsuno

Masayoshi Tsuchiya

Akiyoshi Okada

Richard Gioscia

Kenshiro Tanaka

Toshiyuki Matsuo

Kazunori Imazaki

Katsumi Koshimura

Toshihisa Yokoi

When a radio communication is made between a predetermined base station and a communication terminal, the communication terminal is allowed to make a communication if a predetermined registration processing is made. If the above registration processing is not executed, then predetermined functions other than a communication function of the communication terminal are limited. Moreover, when a predetermined operation mode is set by an operation means, at least a transmission processing at a radio communication means is stopped and an execution of predetermined functions other than the radio communication processing is not restricted. Thus, when a communication terminal apparatus incorporates therein other functions than an audio reproducing function, operation of such function can be limited properly. Moreover, when other functions such as an audio reproducing function are incorporated into a communication terminal apparatus, operations of the functions thus incorporated can be limited properly and the communication functions can be stopped properly.

Method of controlling a communication terminal having a plurality of functions, communication terminal apparatus, communication control system

A method of controlling a communication terminal and a communication terminal that communicates with a base station. The communication terminal having one or more functions different from a communication function, and the execution of the different functions being limited based on a registration process including receiving and registering controlling data transmitted by the base station.

A communication terminal device is miniaturized in a shape handy to carry while maintaining the necessary operability. The terminal device is constituted by a first box for voice communication and a second box linked with the first box via short-distance radio link for data input and data display. The first box is provided with minimum functions necessary for the voice communication so as to be small, whereas the second box can be provided with a keyboard high in operability and a relatively large display means so that display and input for data communication can be made conveniently.

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Tokyo, Japan

Ichiro Hino