| 摘要 |
PROBLEM TO BE SOLVED: To provide synchronism by easily communicating and mapping a relative position relation between two mobile terminals. SOLUTION: During a non-call period, the relative relation of plural moving positions including a present moving position is geometrically made into position information in real time. Only the position information is transmitted away from a call, transmission is simplified, transmission costs are reduced and a position display purpose is silently made abstract and provided. The relative position relation is visualized, and synchronism is provided between both the terminals without necessity of call. These plural moving positions are displayed on the common coordinate system of both the portable terminals. It is preferable that the common coordinate system is the same coordinate system determined by two points and visual information is shared by both the terminals. The moving position, which is not the present moving position, among the plural moving positions is communicated among the plural moving positions as a short message. The short message contains only the position information, communication costs are reduced, a communication velocity is made instantaneous and synchronism is provided more strongly.
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