To provide a mobile communication unit that transmits an electronic mail under a transmission condition, where charging and power consumption become advantageous in a terminal for mobile communication capable of transmission of an electronic mail.

This mobile communication unit 1 consists of a transmission reception section 2 that makes transmission reception with a base station, a measurement section 3 that measures a communication state, an entry section 4 that receives entry by a user, a storage section 5 that stores data of a generated electronic mail and a communication condition or the like, a processing section 6 that conducts input output control or the like of each section, a discrimination section 6a that discriminates whether a communication state satisfies the communication condition, holds transmission of an electronic mail, until the communication condition is satisfied and then immediately transmits the electronic mail whose transmission is held when the communication condition is satisfied, and a display section 7 that displays the transmission state or the like of an electronic mail.