A game device having a touch panel to accept an input by a flick operation according to a contact operation and a slide operation on the touch panel, instructs a flick operation by displaying on the touch panel a screen that instructs a flick operation from a predetermined position in a predetermined direction on the touch panel at a predetermined timing, detects a contact start position on the touch panel by the flick operation, detects the slide direction from the contact start position on the touch panel by the flick operation, detects the contact timing on the touch panel by the flick operation and determines whether to accept or reject the flick operation based on a comparison between the detected contact start position and the predetermined position, a comparison between the detected slide direction and the predetermined direction, and a comparison between the detected contact timing and the predetermined timing.