Communication terminal, position notification method, and communication system

1. A communication system, comprising:

a communication terminal; and

a remote communication device communicating with the communication terminal, wherein:

the communication device issues a position notification instruction to the communication terminal; and

the communication terminal notifies the communication device of a current position of the communication terminal after suppressing representation with which the notifying can be recognized at the communication terminal in response to the position notification instruction, and

wherein the communication terminal comprises

a position detecting section which detects a current position of the communication terminal;

a control section which notifies the communication device of the current position obtained from the position detecting section, in response to an instruction from the communication device; and

a power source section comprising a first power supply section which continuously supplies power to the control section, and a second power supply section which supplies or stops supplying power to all sections of the communication terminal except at least the control section, wherein the second power supply section supplies power to the position detecting section in response to an instruction of the control section while stopping supply of power to other sections.

2. A communication system according to claim 1 , wherein when the instruction received from the communication device instructs to repeatedly notify of the current position of the communication terminal, the control section of the communication terminal repeatedly notifies, in a predetermined cycle, the communication device of the current position of the communication terminal.

3. A communication system according to claim 2 , wherein when an authentication code received from the communication device agrees with a code that has been registered in the communication terminal in advance, the control section notifies the communication device of the current position of the communication terminal.

4. A communication terminal which communicates with a remote communication device, comprising:

a position detecting section which detects a current position of the communication terminal;

a control section which notifies the remote communication device of the current position obtained from the position detecting section, in response to an instruction from the remote communication device; and

a power source section comprising a first power supply section for continuously supplying power to the control section and a second power supply section for supplying power or stopping the supplying of power to all sections of the communication terminal except at least the control section,

wherein the second power supply section supplies power to at least the position detecting section in response to an instruction of the control section while stopping the supplying of power to other sections and stops the supply of power when receiving another instruction which is issued by the control section after completing the notifying of the current position,

wherein when the instruction received from the communication device instructs to notify the communication device of the current position of the communication terminal while keeping an operator of the communication terminal from recognizing this position notification, the control section suppresses representation with which notifying the communication device of the current position can be recognized.

5. A position notification method which is used in a communication terminal communicating with a remote communication device, comprising the steps of:

continuously supplying power to a control section of the communication terminal;

supplying power or stopping the supplying power to all sections of the communication terminal except at least the control section;

receiving by the control section a position notification instruction from the communication device;

supplying power to at least a position detecting section of the communication terminal in response to the position notification instruction received by the control section while stopping the supplying power to other sections;

detecting a current position of the communication terminal in response to the position notification instruction; and

notifying the communication device of the current position of the communication terminal,

wherein when the instruction received from the communication device instructs to notify the communication device of the current position of the communication terminal while keeping an operator of the communication terminal from recognizing the position notification, further comprising the step of suppressing representation with which notifying the communication device of the current position of the communication terminal can be recognized.