Information processing apparatus, information processing system, and controlling method of information processing apparatus

There is provided an information processing apparatus in which a great number of users can use thin clients, and in which various services such as simultaneous picture distribution are realized in an integrated manner, an information processing system, and a controlling method of the information processing apparatus. The apparatus capable of executing plural Operating Systems (OS) includes image transmitting devices having: a Graphics Processing Unit (GPU) for receiving a drawing instruction signal of a screen output from the OS and generating an image signal of a display screen; and a communicator for transmitting the image signal of the display screen to a terminal that operates as a thin client. The devices compresse the image signal to a digital motion picture by a coding unit as necessary. Then, the devices transmit the coded signal from the communicator. The apparatus dynamically assigns the devices to the OSs corresponding to the respective terminals via Virtual Machine Monitor (VMM).