According to one embodiment, a server apparatus includes a memory which stores a management table in which the user IDs are associated with communication bands and treatable data sizes in the communication network with one another, a comparator which refers to the management table in occurring communication requests, and compares respective communication bands and data sizes of a first and a second communication terminals to be objects of the data communication control out of the plurality of communication terminals based on the reference result, and a controller which decides communication bands and data sizes to be assigned between the first and the second communication terminals based on the comparison result from the comparator, and executes a data communication connection between the first and the second communication terminals by using the decided communication bands and the data sizes.