Patent ID: 7403480

Claim:
A data communication terminal comprising: first data communication means for carrying out data communication via a first communication network in which accounting is made according to a transmitted/received data amount; second data communication means for carrying out data communication via a second communication network in which accounting is made according to a connection time; first calculating means for calculating a communication charge according to the transmitted/received data amount of the data communication carried out by the first data communication means; second calculating means for calculating a communication charge according to the connection time of the data communication carried out by the second data communication means; limit amount setting means for setting a communication charge limit amount for a set of objective data to be transmitted/received; selected communication means for selecting one of the first data communication means and the second data communication means to carry out data communication; judging means for selecting one of the first and second calculating means to calculate the communication charge for the data communication carried out by the selected one of the first and second data communication means, and for judging whether the calculated communication charge has reached the communication charge limit amount; and warning means for, when the judging means judges that the calculated communication charge has reached the communication charge limit amount, warning a user that the communication charge has reached the communication charge limit amount.