Apparatus, systems, methods, and computer program products for determining an authentication procedure are disclosed. One apparatus includes a processor and a memory that stores code executable by the processor. The code is executable by the processor to acquire a schedule of a conference and a reference time which is determined on the basis of the schedule, recognize at least one voice of at least one participant who participates in the conference, determine whether the at least one voice of the at least one participant meets a predetermined condition after the elapse of the reference time, and output information for promoting progress of the conference in response to the determining whether the at least one voice of the at least one participant meets the predetermined condition after the elapse of the reference time.