The invention relates to a communication control device and a communication control method, and provides a data allocation control server and a data allocation system which are used for relieving the load of the server for allocating data to a plurality of users. The data allocation control server is provided with a network interface, a data allocation information database and a control part, wherein the network interface is connected with a network and is communicated with a data transmission server, a data transmission auxiliary server and a client; the data transmission server and the data transmission auxiliary server transmit the data to the client according to the requirement of the client; the data allocation information database stores data identifiers for identifying allocation data, a data allocation address for assigning an address of the allocation data and data allocation start-up time for expressing the start-up time of data allocation; the control part transmits allocation data session information to the data transmission server and the data transmission auxiliary server according to a data allocation request from the client to control the data transmission server and the data transmission auxiliary server to allocate the data to the client.