Ntt Docomo, Inc.

Motoyuki Uchida

Yasutaka Urakawa

Tadao Takami

Makoto Ito

Seiji Hoshi

Takashi Kadohiro

Hiroaki Tomoda

Toshio Nojima

Yasunori Suzuki

Even if a portable information terminal is lost or stolen, a third party is prevented from illegally browsing data stored in the portable information terminal. When a control signal is received through wireless communication part and when the received control signal is an instruction signal to execute an encryption process on plaintext data stored in data memory, the plaintext data is encrypted and encrypted data is stored in the data memory. Thereafter, erasing part erases the plaintext data stored in the data memory.

Portable information terminal and data protecting method

To provide a billing system capable of simplifying user's operation and quickly performing a billing process even in the case where there exist a plurality of terminals for billing. A billing systemaccording to the present invention is a billing system for implementing billing by transmitting billing information transmitted from a billing information transmitting terminalto a cellular phone, to a billing serveron a mobile communication network, in which a service code of a service for which a billing process is allowed is preliminarily stored in the cellular phoneand in which, when the billing information is transmitted from the billing information transmitting terminal, whether a service code included in the billing information is a service code for which the cellular phoneis allowed to perform the process is determined on the basis of whether it agrees with any service code preliminarily stored. When it is then determined that the cellular phoneis allowed to perform the billing process, the cellular phone transmits the billing information to the billing serverand performs the billing process.

Billing system, mobile terminal, and billing method

A transmitter cell phoneis provided with a controllerfor fulfilling functions of a data encryptor, a first key encryptor, and an encryption file generator. The data encryptor encrypts data, using a first encryption key. The first key encryptor encrypts the first encryption key, using a second encryption key. The encryption file generator generates an encryption file of the data from the data encrypted by the data encryptor, the first encryption key encrypted by the first key encryptor, and user-specific information permitting identification of a user of the mobile communication terminal.

Mobile communication terminal, information processing method, data processing program, and recording medium

There is provided a guidance information notification apparatus in a communication network system which enables improvement of convenience to a user by dispensing with a particular operation other than a normal origination operation required when a user obtains a guidance message in an understandable language such as a native language, with a terminal unit, and by enabling the user to receive support from a communication operator of the user's contract network even when a roaming service is provided. If an originator inputs a destination telephone number with a normal origination operation at a mobile telephone set, a guidance information notification apparatus-notifies guidance message information in a language associated with the origination telephone number to the origination mobile telephone set. Similarly, a guidance information notification apparatus-notifies guidance message information in the language associated with the destination telephone number to the destination fixed telephone set. Furthermore, a direction to process guidance message information is received from a switchboardor, and the guidance message information is notified to the telephone setorin response to this direction.

Guidance information notification apparatus in communication network system, communication network system and guidance information notification method

An information communication systemaccording to the present invention is comprised of a cellular phonehaving a data storage, a data list transmitter, and a data transmitterand a cellular phonehaving a check list DBand a data receiver. The cellular phonemakes the data list transmittertransmit a data list of content data stored in the data storage, to the cellular phone. The cellular phonecollates the data list with a check list stored in the check list DBto generate a request list, and transmits the request list to the cellular phone. The cellular phoneextracts the content data recorded in the received request list from the data storageand transmits the content data to the cellular phone. The cellular phonereceives the content data through the data receiver

Transmission-side mobile unit, reception-side mobile unit, information communication system, information communication method, and server apparatus

In an input signal power dynamic range compressing circuit, an input signal is distributed by a directional coupler to a linear signal transfer path and a compressing signal generating path, and in the compressing signal generating path a compressing signal, which keeps the peak-to-average-power ratio of the input signal below a predetermined value, is generated from the input signal. The compressing signal is combined by a power combiner with the input signal having passed through the linear signal transfer path.

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Yokosuka, Japan

Motoyuki Uchida