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The purpose of this paper is to find a structure of information expressed in signs. Analysis shows that the arrow of time must be included in its constituent elements.

The objective was achieved by discussing some important concepts of sign, both philosophical and semiotic. The results were then applied to a case study and also referred to collecting, searching and processing information.

The results of the research are as follows: a sign structure useful for information science is composed of five elements: the sign itself, the sender of an information's content, the recipient of the information's content, a context in which a sign appears and a situation (or an object) in reality to which a sign refers. The place of the arrow of time is in the element called a context.

Further research should concentrate on the following subjects: the active or passive role of a person in sign-situations; and the sign as a subjective/objective entity.

Such a solution seems to be useful in the area of information science.

Two new ideas have appeared in this paper: the five-element conception of sign with a place for the arrow of time; and applying this idea into an analysis case study and research on collecting, searching and processing information.