The present invention provides a ring bus type multicore system including one memory, a main memory controller for connecting the memory to a ring bus; and multiple cores connected in the shape of the ring bus, wherein each of the cores further includes a cache interface and a cache controller for controlling or managing the interface, and the cache controller of each of the cores connected in the shape of the ring bus executes a step of snooping data on the request through the cache interface; and when the cache of the core holds the data, a step of controlling the core to receive the request and return the data to the requester core, or, when the cache of the core does not hold the data, the main memory controller executes a step of reading the data from the memory and sending the data to the requester core.