Communication system and line selecting method

A line selecting device, comprising:

• a communication means capable of using plural types of communication lines;
• a storage means in which information on communication fees for respective communication lines is stored;
• and
• a selection means for selecting the most inexpensive communication line according to a communication mode to be used, based on the information on communication fees stored in said storage means.

A communication terminal, comprising:

• a communication means capable of using plural types of communication lines;
• a storage means in which information on communication fees for respective communication lines is stored;
• a selection means for selecting the most inexpensive communication line according to a communication mode to be used, based on the information on communication fees stored in said storage means;
• and
• a control means for, at the start of communication, controlling said selection means so that a communication line is selected and controlling said communication means so that the communication line is selectively established.

A billing server, comprising:

• a first storage means for storing information indicating types of respective communication services used by each of users with respect to each user;
• a second storage means for storing fee information on a plurality of communication services;
• an individual fee data generating means for unifying fee information on one or plural communication services used by each of the users to generate individual fee data with respect to each user, based on the information indicating the types of the respective communication services used by each of the users and the fee information on the respective communication services;
• and
• a sending means for sending the individual fee data for the user to a communication terminal of the user.

A mobile communication system for providing a plurality of communication services, comprising:

• a mobile communication terminal which is allowed to obtain the plurality of mobile communication services and sends an identification code unique to itself when making an outgoing call;
• a plurality of control servers which are provided for the plurality of mobile communication services, when said mobile communication terminal makes the outgoing call, acquires the unique identification code for specifying said mobile communication terminal, and stores billing information on said mobile communication terminal in association with the identification code;
• and
• a billing server which classifies the billing information stored in all of said control servers by each mobile communication terminal based on the identification code and generates billing information on each user.

A line selecting method, comprising the steps of:

• extracting fee information on communication services used by each of users from fee information on a plurality of communication services and unifying it to generate individual fee data;
• sending the generated individual fee data to a communication terminal of the user;
• receiving the individual fee data by the communication terminal of the user;
• and
• selecting the most inexpensive communication line according to a communication mode to be used, based on the received individual fee data by the communication terminal of the user.

A control program embodied on record medium or a carrier wave, for making electronic equipment function as:

• a communication means capable of using plural types of communication lines;
• a storage means in which information on communication fees for respective communication lines is stored;
• and
• a selection means for selecting the most inexpensive communication line according to a communication mode to be used, based on the information on communication fees stored in the storage means.