Although difficult game stages may not be cleared by unskilled players, by making the stages easy to be cleared, the degree of difficulty of the game would be lowered and the amusement of the game would be reduced. The present invention comprises: a storing device 102 capable of storing the number of certain marks displayed in an virtual space and which are in the player's hand, as well as displaying the position of such marks; a processing circuit 10 for advancing the respective steps of game control in sequence by referring to the operation signals supplied from an input device 2b, the number of marks in hand and positions thereof stored in the storing device, and for outputting displaying image data related thereto; a displaying circuit 11 for displaying a displaying image including the segment and marks on the basis of displaying image data supplied from the processing circuit. The processing circuit 10 generates displaying image data displaying said marks in the displaying image according to the operation signals, and stores the displaying positions of the marks in the storing device 102, and generates-displaying image data for displaying the segment at the displaying positions stored in the storing device 102 when the segment is unable to continue moving.