| 摘要 |
According to the invention, it is possible that a plurality of terminals participate in interaction processing without imposing limitations such as presence or absence of pre-registration and a kind of a terminal. Further, even if the interaction processing is disconnected halfway through a task, it is possible to resume the interaction processing from a status in which disconnection has occurred. While ContextID for identifying the interaction processing and StateID for indicating a degree of progress of the interaction processing are stored in a ContextID database 6, ContextID and StateID are transmitted to the terminal. Then, in the case where the same ContextID is received from another terminal, another terminal is caused to participate in the ongoing interaction processing halfway through a task. Further, the interaction processing is caused to be resumed from the point, in which the interaction processing is interrupted, by referring to StateID.
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