There is provided a communication device comprising: a conversion unit configured to convert first data to second data having a predetermined format; a communication interface configured to interface the communication device with a network; a transmission unit configured to transmit the second data to an external device through the communication interface; a judgment unit configured to judge whether trouble would arise with respect to transmission of the second data to be executed by the transmission unit; and a storage control unit configured to store the second data while associating identification information of the external device with the second data in response to a fact that the judgment unit judges that the trouble would arise with respect to the transmission of the second data.