An electronic information processing system (1) wherein a brain activity detection unit (3) detects a user's brain activity. A change determination unit (2d) determines whether it is necessary to change from one character input mode to another character input mode by using a detection result from the brain activity detection unit (3) after characters in accordance with one character input mode set by a character input mode setting unit (2b) have been displayed on a display unit (8) by a display control unit (2c). When the change determination unit determines that it is necessary to change from one character input mode to another character input mode, the character input mode setting unit sets another character input mode in place of the one character input mode.
ELECTRONIC INFORMATION PROCESSING SYSTEM AND COMPUTER PROGRAM