Abstract: An information processing apparatus is included that is installed to an operator connected to a portable terminal apparatus by a communication line and is connected by a network to a plurality of operators selectable as a roaming destination of the portable terminal apparatus. The information processing apparatus includes a database that stores operator information, and an information distributing unit that, in response to receiving specification of an area of the roaming destination from the portable terminal apparatus, reads from the database operator information on an operator having a service area thereof in the specified area and distributes the read information to the portable terminal apparatus.

Abstract: A mobile communication system comprise: a reception unit receiving data from a mobile terminal having a phone call function via a common channel being a communication channel through which a plurality of mobile terminals receive data; a storage unit storing data received by the reception unit and an identifier of the mobile terminal serving as a transmission source of the data in association with each other; and an answer unit reading, when a phone call device having a phone call function makes a call to the mobile terminal, the data stored in the storage unit in association with the mobile terminal serving as a call destination to send a response based on the data to the phone call device.

Abstract: A communication apparatus for communicating with another apparatus via a network, includes: a storage unit for storing identification information of a plurality of networks and areas where the networks are deployed, respectively, and information of time periods while communication over the networks is permissible for the communication apparatus, respectively; a processor to control communication with the another apparatus in accordance with a process including: selecting one of the networks which is currently connectable and available to communicate with the another apparatus on the basis of the identification information of the networks and the areas; determining whether the present time is within one of the time periods; and either inhibiting communication with the another apparatus via the selected network when the present time is not within the period of time, or allowing communication with the another apparatus via the selected network when the present time is within the period of time.

Abstract: A mobile communication system comprise: a reception unit receiving data from a mobile terminal having a phone call function via a common channel being a communication channel through which a plurality of mobile terminals receive data; a storage unit storing data received by the reception unit and an identifier of the mobile terminal serving as a transmission source of the data in association with each other; and an answer unit reading, when a phone call device having a phone call function makes a call to the mobile terminal, the data stored in the storage unit in association with the mobile terminal serving as a call destination to send a response based on the data to the phone call device.

Abstract: An information processing apparatus is included that is installed to an operator connected to a portable terminal apparatus by a communication line and is connected by a network to a plurality of operators selectable as a roaming destination of the portable terminal apparatus. The information processing apparatus includes a database that stores operator information, and an information distributing unit that, in response to receiving specification of an area of the roaming destination from the portable terminal apparatus, reads from the database operator information on an operator having a service area thereof in the specified area and distributes the read information to the portable terminal apparatus.

Abstract: In the communication system having a first communication terminal device which performs peer-to-peer communication, and a second communication terminal device which performs communication via a communication network. The first communication terminal device includes: a relay application section which applies for communication relay via the communication network to the second communication terminal device; and a relay result receiving section which receives a result of communication performed by the second communication terminal device via the communication network. The second communication terminal device includes: an application receiving section which receives a communication relay application from the first communication terminal device; a relay communication section which performs communication via the communication network; and a relay result transmitting section which transmits the result of communication by the relay communication section, to the first communication terminal device.

Abstract: A WCDMA mobile communication system that makes it possible for a mobile device to use the minimum radio resources more directly (that is, at the level of an earlier stage) by controlling the states of the uplink and downlink separately, wherein the mobile station includes monitoring unit for monitoring the uplink data flow amount; state determination unit for determining a desired uplink state from the monitoring result of the data flow amount of the monitoring unit; and transmission unit for transmitting a request to establish the uplink state determined by the state determination unit to the base transceiver station apparatus; and the base transceiver station apparatus comprises determination unit for determining an uplink state in response to the uplink state change request; and unit for communicating a change in the determined uplink state by way of response to the mobile station.