Video game device, character growth control method for video game and readable storage medium storing growth control program

A video game device of this invention comprises a speech/action storage device for storing contents of various speeches and actions of a leader character to be given to a main character as an ability growth object; an ability value updating device for successively updating an ability value of the main character according to the execution result of the content of the speech/action; a parameter storage device for storing an enthusiasm parameter which is set to be a positive value for each training-related speech/action and a negative value for any other speech/action; an enthusiasm parameter adding device for adding a set value to a present enthusiasm parameter given to the main character every time the speech/action is executed; a reliability degree calculating means for calculating a reliability degree between the main character and the leader character; and a judging device for judging a successful growth of the main character.