Data processing including encoding and sending is disclosed, which includes: encoding data using a selected one of a plurality of parameter sets each of which has at least one encoding parameter; calculating a length of an assigned time not exceeding a time limit for an original data set to be sent, per each data sub-set; calculating an estimate of an individual processing time TP to encode and send each data sub-set using a successively-selected one of the plurality of encoding parameter sets, based on the assigned time, an estimate of an encoding time TE to encode each data sub-set using the successively-selected one encoding parameter set, and an estimate of a sending time TT to send the encoded data sub-set; and selecting one of the plurality of encoding parameter sets to allow a total processing time not to exceed the time limit.