1. A video game apparatus for advancing a game in a virtual space where a player character which acts according to an operation by a player and two or more instructed characters which act according to a task instructed from the player character exist, respectively different parameters being set on the instructed characters, said game being advanced according to a result of an action of each of the instructed characters, the apparatus comprising: a memory that stores two or more tasks which the player character can get the instructed character to execute according to a scenario development of the game; a task display system that displays, at a time when the scenario development of the game reaches a predetermined position, the tasks to be displayed at the time on a display from said memory so as to be selected by the player; a candidate character selection display system that determines candidate characters from the instructed characters, the candidate character being possible to participate in the task selected among the displayed tasks by the player through input means and displays the determined candidate characters on the display so as to be selected by the player; a participant character determining system that determines the character selected by the player through the input means from the candidate characters as a participant character, which executes the selected subject; and a task execution system that executes the task according to the parameter which is set on the participant character on the basis of the determined participant character and the selected task.