INFORMATION PROCESSING SYSTEM, INFORMATION PROCESSING APPARATUS, STORAGE MEDIUM, AND INFORMATION PROCESSING METHOD

An example of an information processing system executes a draw for choosing one or more game character based on selection probabilities from among a group of game characters, wherein at least one of the game characters chosen by a draw is granted to the user. When a game character of a first group is granted by a draw, a first selection probability value for game characters of the first group is changed to a first base value, and a second selection probability value for game characters of a second group is changed to the second base value. When a game character of the second group is granted by a draw and a boost value of the first selection probability is greater than a predetermined value, the first selection probability value is at least lowered so that the first selection probability value is greater than the first base value.