To provide an information processor, its method and a storage medium capable of securing normal transmission by suitably controlling transmission processing in accordance with data volume inputted for transmission and suppressing the resource consumption of a system.

Picture data are read out from an original 1 set up in an original feeder part 2 and the read data are transferred from a memory 4 and stored in a hard disk 5 while data volume is monitored by a data monitoring means 10. Whether the capacity Q of the picture data stored in the hard disk 5 reaches upper limit capacity LMT allowed to be normally delivered by a network adaptor 6 or not is discriminated on the basis of the monitored result of the means 10. The picture data are continuously read out and stored until there is no original 1 on the feeder part 2 when the capacity Q does not reach the capacity LMT, but when the capacity Q reaches the capacity LMT, a message for ending the reading of the original 1 is displayed and the picture data already read out and stored in the hard disk 5 are transmitted by an electronic mail without reading out remaining originals 1.