PURPOSE: To reduce the processing time of multiple address processing by utilizing effectively an electronic computer resource.

CONSTITUTION: A destination items number count means 2 references a transmission destination storage area 10 to count a destination item number of each transmission data. A virtual data length calculation means 3 obtains a virtual data length of each transmission data based on the destination item number of each transmission data and a data length of each transmission data. A transmission sequence decision means 4 decides the transmission sequence of transmission data based on the virtual data length and sets the sequence of the transmission destinations tentatively relating to each transmission data. A transmission district correction means 5 corrects the sequence of the transmission destination relating to each transmission data by taking the district nature of the transmission destination into account. A transmission means 7 sends data contents of each transmission data stored in a transmission data storage area 20 based on the transmission sequence of the transmission data and the sequence of the transmission destination decided as above.