A sharing support server that supports use of a resource to be shared among a plurality of users includes circuitry to receive, from a communication terminal being used in an event, information on an action item generated in the event using the resource, and store, in a memory, first information, which indicates a storage location of image data indicating content of the action item, and second information, which indicates whether the action item is a main or a sub, and further indicates, when indicating the sub, relationship with a corresponding main action item in association with each other. The circuitry receives, from the communication terminal, an action item check request, generates, in response to the request, screen data that includes the image data representing the content identified by the first information and data representing the relationship identified by the second information, and transmits the screen data to the communication terminal.