1. A platform apparatus that processes the execution results of one or more serious games, the platform apparatus comprising: a data processing unit that receives output packets produced from each serious game in execution for measuring and developing a user's cognitive abilities and that generates game data from the output packets; an analysis processing unit that generates, based on the game data, analysis data for measuring the user's brain function; and a result display unit that displays the analysis data to the user through an UI (user interface), wherein the one or more serious game includes one or more of a serious game for memory, a serious game for psycho-motor, a serious game for attention, a serious game for executive function, and a serious game for emotion, the output packets contain one or more of information of a user playing the serious game, information of a character used by the user during execution of the serious game, time information of the user for operating the input device, position information of a cursor the user controlling via the input device, information of a collision between the character and objects appearing in the serious game, a correct answer rate of the user's response to events in the game, and a reaction error rate of the user's response to the events, and the game data contains one or more of a reaction time of the user to the events occurring during the execution of the serious game, a reaction error rate of the user's response to the events, and an accumulated distance of the cursor movement during the execution of the serious game.