INFORMATION SHARING METHOD, DEVICE AND PROGRAM

PROBLEM TO BE SOLVED: To provide an information sharing method, device and program that facilitate an understanding of the publicity state of each node forming a tree structure. SOLUTION: Upon a publicity state operating request for changing the publicity state of any node, execution possibility determining means 11 refer to the publicity state of each node on a storage device 4 to determine whether or not the publicity state operating request is executable under the condition that a maximum change in the publicity state is one in every path from a home route node to each leaf node. Publicity state operating means 13 execute a publicity state operating request determined to be executable by the execution possibility determining means 11 so as to meet the condition. Upon a tree structure operating request for changing a tree structure, a tree structure operation part 12 refers to publicity states and executes the tree structure operating request so as to meet the condition. COPYRIGHT: (C)2004,JPO&NCIPI