Abstract: A sharing assistant server includes circuitry to store an event ID identifying an event including jobs to be executed, an event name, event start and end times, in association with each other, and the event ID, job content information indicating the jobs and defining an order of the jobs, and job execution times corresponding to the jobs, in association with each other. The circuitry receives, from a communication terminal, image data indicating an action item generated in the event and a determination time indicating a time when the item is determined, identifies, from among the jobs each of which is assigned with the corresponding job execution time in the order between the event start and end times, one of which the job execution time includes the determination time, and transmits, to a management server, the image data, the event name, and information on the identified job.