Method for altering service-provision sequence without leaving customers with a sense of unfairness. Question data Q1, Q2 containing question content, priority level, membership number, and other information is transmitted from questioner terminals 2a, b (#2, 5). An alter-sequence request to switch the sequential order of question data Q2 to a higher rank is transmitted from questioner terminal 2b to question administration server 1 (#7). An inquiry with questioner terminal 2a as to changing sequential order according to priority levels for question data Q1 and question data Q2 is conducted (#8). When a notice indicating that a sequence change will be permitted is transmitted from questioner terminal 2a (#9), the sequential orders for question data Q1 and for question data Q2 are interchanged, and question terminal 2b is notified to the effect that the sequence has been changed (#10).