A communication system, comprising: a first electronic whiteboard (2α) settable with first setting information for a plurality of items; and a second electronic whiteboard (2, 2A, 2B) settable with second setting information for the plurality of items, and communicably connected to the first electronic whiteboard (2α) to acquire the first setting information, the first electronic whiteboard (2α) including an information transmission unit (101, 14) configured to transmit, to the second electronic whiteboard (2, 2A, 2B), the first setting information including determination information set for each of the plurality of items to determine whether the first setting information is synchronized with the second setting information for each of the plurality of item, the second electronic whiteboard (2, 2A, 2B) including an information receiving unit (101, 16) configured to receive the first setting information, and an information reflecting unit (101, 15) configured to determine whether the first setting information is synchronized with the second setting information for each of the plurality of items based on the determination information included in the first setting information received by the information receiving unit (101, 16), and reflect a value set for one of the plurality of items of the first setting information on the second setting information, in response to a determination indicating that the first setting information is synchronized with the second setting information for the one of the plurality of items, characterized in that the first electronic whiteboard and the second electronic whiteboard are configured to directly communicate with each other, and the second electronic whiteboard is configured to receive the first setting information from the first electronic whiteboard and compare the first setting information with the second setting information for each of the plurality items to update the second setting information according to the comparison. a first electronic whiteboard (2α) settable with first setting information for a plurality of items; and a second electronic whiteboard (2, 2A, 2B) settable with second setting information for the plurality of items, and communicably connected to the first electronic whiteboard (2α) to acquire the first setting information, the first electronic whiteboard (2α) including an information transmission unit (101, 14) configured to transmit, to the second electronic whiteboard (2, 2A, 2B), the first setting information including determination information set for each of the plurality of items to determine whether the first setting information is synchronized with the second setting information for each of the plurality of item, the second electronic whiteboard (2, 2A, 2B) including an information receiving unit (101, 16) configured to receive the first setting information, and an information reflecting unit (101, 15) configured to determine whether the first setting information is synchronized with the second setting information for each of the plurality of items based on the determination information included in the first setting information received by the information receiving unit (101, 16), and reflect a value set for one of the plurality of items of the first setting information on the second setting information, in response to a determination indicating that the first setting information is synchronized with the second setting information for the one of the plurality of items, characterized in that the first electronic whiteboard and the second electronic whiteboard are configured to directly communicate with each other, and the second electronic whiteboard is configured to receive the first setting information from the first electronic whiteboard and compare the first setting information with the second setting information for each of the plurality items to update the second setting information according to the comparison.