The invention discloses a
data sharing method and device of an
interactive whiteboard and a communication
system. The method relates to an SDK
server, a first
client and a second
client group. The method comprises the following steps of: firstly, converting a document uploaded by the first
client into picture information, and
broadcasting the picture information to each client by the SDK
server; making each client request a document picture with
watermark information according to the picture information, create the same document
whiteboard in real time and display the document picture; and meanwhile, making the SDK
server broadcast the graffiti operation of a user on the document to other clients, thereby realizing that synchronous display of the operation. According to the method, multi-party
document sharing and graffiti synchronous display can be realized, the problems of slow
data transmission, long time
delay, poor interactive experience and the like during communication of a traditional
interactive whiteboard are solved, the problems of tampering, picture stealing and the like are effectively prevented by adding character watermarks to document pictures, the requirements of
document sharing in the fields of finance, education and the like are met, and more convenient,
safer and more efficient interaction experience is brought.