A card game system is disclosed, which enables to execute the card game using a basic function of a video game apparatus. The card game system includes a card acceptance means for accepting a plurality of cards of either a first category or a second category each having information attached thereto for identifying each, a memory for storing card data and a program for controlling a card game, and a controlling means for defining the first category cards as the cards for use in a card game based on the card data, and for controlling to execute the card game according to the program stored in the memory, wherein the control means controls to execute the card game depending on the number of second category cards detected by the card acceptance means.