Information terminal and information sharing method are provided which consider survival time of contents at a transmission destination and propagate the contents widely so as to be suitable for contents sharing. Each duty cycle of the two control signals is smaller than 50%. Filtered information may be prioritized based on proximity, time, or past preferences. The method further includes transmitting data to at least one VLC receiver using the light from the at least one light source. The deposited metal or metal nitride film may then be exposed to a plasma to remove contaminants, densify the film, and reduce film resistivity.