Patent ID: 7231222

Claim:
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.