A semiconductor device includes a memory device configured to have a first buffer and a second buffer, the first buffer storing a plurality of requests sent to a plurality of destinations, the second buffer storing identification information of the entry associated with a first destination of a first request written to first buffer; and an entry selector configured to identify the first destination from the plurality of destinations when the identification information of the entry is stored in the second buffer, and to read the first request from the plurality of requests stored in the first buffer by using the first destination.