PURPOSE: To simply and surely end the operations of all computers by preparing an end request means, an answer process means, an answer return means, an end means, an end request acceptance means, etc., and by giving an end instruction to a single computer only.

CONSTITUTION: An end request acceptance means 5 accepts an end request from a master node computer. A node position recognizing means 6 checks whether a slave node contains a computer or not based on the node information stored in a node position information storage means 7. If so, an end request means 1 gives the end requests to the computers of all slave nodes. When an answer process means 2 receives the answers from all slave nodes, an answer return means 3 sends an answer of the end request to the master node computer. Then an end means 4 ends the operation of the computer. Thus it is possible to simply and surely end the operations of all follower computers just by giving an end instruction to a single computer only.