Media for videophone communication, media for communication navigation, media for i-mode packet communication, and media for handling video data as streaming data are linked to a server so that the server can receive data from the media of each type. A user of data of different types of communication specifications performs communication by using an information terminal (e.g., in a vehicle) so as to simultaneously capture data of the different types from the server. The server converts the data of the different types into data in accordance with a single (e.g., H.323 or H.324) communication protocol, and adds codes to each type of data. The type of data is re-divided depending on a predetermined data amount for each data item, and numbers are sequentially added to the divided data segments. The divided data segments are rearranged and transmitted. The user performs a reverse process to restore the original data for use as an output.