Patent ID: 8360891

Claim:
A device comprising: a memory unit which stores a position of a player character moving in a virtual space in accordance with an instruction from a player, a position of an enemy character, and candidates of a new position where a new enemy character is to appear in the virtual space; a measuring unit which measures an elapsed time from a time when the enemy character appears in the virtual space up to a time when the new enemy character is to appear in the virtual space and stores the measured elapsed time in the memory unit; a calculating unit which calculates a distance monotonically increasing relative to the stored elapsed time; an appearance determining unit which determines whether to cause a new enemy character to appear in the virtual space; and an appearance setting unit which, when the appearance determining unit determines to cause the new enemy character to appear: selects one of the candidates which has a distance from the player character which is closest to the calculated distance, and stores the selected one of the candidates as the new position where the new enemy character is to appear causes the new enemy character to appear at the new position.