An information processing system comprising: a parent terminal having: a storage section operable to store device information including a drawing capability of a child terminal and language information, an encoding section operable to generate transmission data of a user interface or a content in accordance with the device information and with the language information, wherein the encoding section is operable to change a data compression rate of the transmission data in accordance with a control signal received from the child terminal; and a first transmission section operable to transmit the transmission data generated by the encoding section to the child terminal across a network; and a child terminal having: a CPU; a receiving section operable to receive the transmission data, and a display section operable to display a user interface screen or a content playback screen on the basis of the transmission data, a calculation capability monitoring section (60, 61) operable to monitor usage of the CPU of the child terminal and to generate a level of calculation capability on the basis of the usage of the CPU; a receiving capability monitoring section operable to monitor a network receiving capability of the child terminal, and a second transmission section operable to transmit the control signal including a level of the network receiving capability and the level of the calculation capability to the parent terminal. a parent terminal having: a storage section operable to store device information including a drawing capability of a child terminal and language information, an encoding section operable to generate transmission data of a user interface or a content in accordance with the device information and with the language information, wherein the encoding section is operable to change a data compression rate of the transmission data in accordance with a control signal received from the child terminal; and a first transmission section operable to transmit the transmission data generated by the encoding section to the child terminal across a network; and a storage section operable to store device information including a drawing capability of a child terminal and language information, an encoding section operable to generate transmission data of a user interface or a content in accordance with the device information and with the language information, wherein the encoding section is operable to change a data compression rate of the transmission data in accordance with a control signal received from the child terminal; and a first transmission section operable to transmit the transmission data generated by the encoding section to the child terminal across a network; and a child terminal having: a CPU; a receiving section operable to receive the transmission data, and a display section operable to display a user interface screen or a content playback screen on the basis of the transmission data, a calculation capability monitoring section (60, 61) operable to monitor usage of the CPU of the child terminal and to generate a level of calculation capability on the basis of the usage of the CPU; a receiving capability monitoring section operable to monitor a network receiving capability of the child terminal, and a second transmission section operable to transmit the control signal including a level of the network receiving capability and the level of the calculation capability to the parent terminal. a CPU; a receiving section operable to receive the transmission data, and a display section operable to display a user interface screen or a content playback screen on the basis of the transmission data, a calculation capability monitoring section (60, 61) operable to monitor usage of the CPU of the child terminal and to generate a level of calculation capability on the basis of the usage of the CPU; a receiving capability monitoring section operable to monitor a network receiving capability of the child terminal, and a second transmission section operable to transmit the control signal including a level of the network receiving capability and the level of the calculation capability to the parent terminal.