Mobile communication terminal and method for controlling the same

1. A mobile communication terminal which can transmit data to a partner communication terminal provided with data transmission/reception services identical or compatible with the mobile communication terminal, by selecting any one of a plurality of transmission methods, the mobile communication terminal comprising:

means for initially establishing any one of a plurality of bearers which correspond to the plurality of transmission methods, respectively;

means, contained in the terminal, for creating and editing message data for transmission to the partner communication terminal;

bearer changing means, contained in the terminal, for changing a transmission method;

means for comparing an amount of the created message data with a predetermined threshold during or after edition of the message data;

means for presenting a prompt before a user to cause the user to decide whether the initially established bearer should be changed to another bearer on the basis of a result of comparison by the comparing means and for accepting an instruction for bearer chance from the user; and

means adapted to operate in such a way that if the bearer chance is instructed by the user, the initially established bearer is changed to another bearer to perform the data transmission using a transmission method corresponding to the other bearer, and if the bearer change is not instructed by the user, (i) when the amount of the created message data exceeds the predetermined threshold, an operation of the mobile communication terminal is transferred to a state wherein message data is to be edited again, and (ii) when the amount of the created message data is equal to or less than the predetermined threshold, the data transmission is performed using a transmission method corresponding to the initially established bearer.

2. The mobile communication terminal according to claim 1 , wherein each of said bearer changing means and said bearer automatic judging means includes means for setting valid/invalid of an operation function of each of said bearer changing means and said bearer automatic judging means.

3. The mobile communication terminal according to claim 2 , wherein said valid/invalid setting means includes means for registering the setting of valid/invalid of said bearer changing means and said bearer automatic judging means, for each transmission partner.

4. The mobile communication terminal according to claim 1 , 2 or 3 , further comprising means for setting or changing a destination in accordance with the transmission method selected or changed by said bearer changing means and said bearer automatic judging means, if the destination to be designated as a transmission destination of message data is different for each transmission method.

5. The mobile communication terminal according to any one of claims 1 to 3 , wherein the message data is any one or a set of ones of a newly created message, a transfer message and a return message.

6. A control method for controlling a mobile communication terminal which has a bearer changing function and a bearer automatic judging function and can transmit data to a partner communication terminal provided with data transmission/reception services identical or compatible with the mobile communication terminal, by selecting any one of a plurality of transmission methods, said control method comprising the steps of:

initially establishing any one of a plurality of bearers which correspond to the plurality of transmission methods, respectively;

creating and editing in the terminal message data for transmission to the partner communication terminal;

comparing an amount of the created message data with a predetermined threshold during or after edition of the message data;

presenting a prompt before a user to cause the user to decide whether the initially established bearer should be changed to another bearer on the basis of a result of comparison by the comparing step and for accepting an instruction for bearer change from the user; and

operating in such a way that if the bearer change is instructed by the user, the initially established bearer is changed to another bearer to perform the data transmission using a transmission method corresponding to the other bearer, and if the bearer change is not instructed by the user, (i) when the amount of the created message data exceeds the predetermined threshold, an operation of the mobile communication terminal is transferred to a state wherein message data is to be edited again, and (ii) when the amount of the created message data is equal to or less than the predetermined threshold, the data transmission is performed using a transmission method corresponding to the initially established bearer.

7. The method for controlling a mobile communication terminal according to claim 6 , wherein said judging step includes monitoring whether the contents of message data during edition satisfies a transmission capability condition of the transmission method selected before the edition,

wherein a new indicative of re-selection for transmission methods is displayed on said display unit if it is confirmed that the transmission capability condition is not satisfied; and

wherein the transmission selected before the edition is changed to a re-selected transmission method if the transmission method is re-selected, or the operation of the mobile communication terminal is transferred to the state that message data is to be edited again, if the transmission method is not re-selected.

8. The method for controlling a mobile communication terminal according to claim 6 , wherein said judging step includes deciding whether the contents of message data after edition satisfies a transmission capability condition of the transmission method selected before the edition,

wherein it is judged whether the transmission capability condition of another transmission method is satisfied, if it is judged that the transmission capability condition is satisfied;

wherein a menu indicative of changeability to the other transmission method is displayed on said display unit, if the transmission capability condition of the other transmission method is also satisfied; and

wherein a current transmission method is not changed if there is no instruction to change to the other transmission method, or the current transmission method is changed to the other transmission method if there is an instruction to change to the other transmission method.

9. The method for controlling a mobile communication terminal according to claim 6 , wherein the displaying step including displaying on the display unit a selection menu to cause to select either message data transmission by the judged transmission method or message data transmission by another transmission method, said control method further comprising the steps of:

transmitting the data by the judged transmission method if the data transmission by the judged transmission method is selected, or notifying the user of that data is transmitted by the other transmission method and that message data is to be edited again in accordance with a transmission capability condition of the other transmission method, if the data transmission by the other transmission method is selected;

editing the message data again in accordance with the transmission capability condition of the other transmission method; and

transmitting the re-edited message data.

10. The method for controlling a mobile communication terminal according to any one of claims 6 to 9 , wherein the message data is any one or a set of ones of a newly created message, a transfer message and a return message.

11. The method for controlling a mobile communication terminal according to any one of claims 6 to 9 , wherein the contents of the data include a data size of the message data and information concerning presence/absence of a file to be attached.