PROBLEM TO BE SOLVED: To enable a player to play an RPG without wasting time. SOLUTION: A treasure-chest item present in a scene where a player character arrives can be brought back by the player character to a treasure-chest chamber 512. After the player character 511 has found a key item and returned to the chamber 512, a determination is made as to whether or not the treasure- chest item corresponding to the key item which the player character 511 acquired is in the chamber 512. If the treasure-chest item corresponding to the key item which the player character 511 acquired is in the chamber 512, the player character opens the corresponding treasure-chest item. That is, the lid of the treasure-chest item TC corresponding to the key item KC held by the player character 511 is opened. Thus, the player character 511 can acquire treasures or weapon items virtually stored in the treasure-chest item TC.
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