To perform data communication by a communication method satisfying a condition desired by a user.

This portable telephone set 1 notifies the user of a communication method with the lowest communication cost at the present time on the basis of the color of a lamp turned on in a communication cost notice LED 10 to allow the user to immediately recognize the superiority and inferiority of relevant communication costs, thereby making the user determine whether to perform data communication in accordance with the superiority and inferiority of the relevant communication costs without making the user be aware of the communication method. Thus, the user is prevented from selecting mistakenly a communication method with an expensive communication cost in advance, consequently allowing the user to perform data communication by a communication method satisfying the communication cost desired by the user.

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