To smoothly transfer an abutter on a virtual space.

A user terminal 3-1 is constituted of a virtual space managing part 31, a communication control part 32, a virtual space information storage part 33, a UI control part 34, an object abutter managing part 35 and a collision judging part 36. The whole of the user terminal 3-1 is controlled by the virtual space managing part 31. Positions and states of the object and the abutter on a virtual space at present point of time are managed by the object abutter managing part 35. The abutter is judged whether it collides with other abutters or the object or not based on mobile information to be inputted from the virtual space managing part 31 and position information of the object and the abutter at the present point of time to be inputted from the object abutter managing part 35 by the collision judging part 36.