PROBLEM TO BE SOLVED: To provide a system for supporting a conjecture about the situation where the caller makes the call.SOLUTION: A notification program determines whether or not call occurs. When the call is determined to have occurred, the notification program determines whether or not the past state corresponding to the callers state at this call exists in a memory part where the callers state at the past call is stored. If the past state exists, the notification program makes a computer execute a process of notification of the past state.