When information is transmitted among a plurality of devices connected
through a network, an information opening data storage section for
opening predetermined information is set to devices connected through the
network, the information opening data storage section is formed in
descriptor format having a predetermined hierarchical structure,
predetermined information is stored in a board 910 set in the descriptor
format, the position at which the predetermined board 900 is stored is
directly instructed by the highest-order descriptor 900 having the
hierarchical structure, and information concerning a predetermined
information is stored in information areas 921, 922, 931, 932 instructed
when the hierarchical structure is retrieved from the highest-order
descriptor 900.