In order to solve problems of conventional multilingual display method represented by simultaneous multilingual display and language switching display, the authors have proposed a bilingual superimposed display.
The purpose of this study is therefore to propose the method and to evaluate it with an experiment by searching optimal bilingual superimposed display and comparing its reading speed with that of language switching display method.
In the experiment, two tasks were conducted as follows;
(1) Optimal display search task was carried out to optimize reading speed of bilingual superimposed display based on participants’ subjective evaluations using interactive genetic algorithm.
(2) Silent reading task was carried out to measure reading speed of sentences with monolingual display and optimized bilingual superimposed display.
Then, the model of language switching display was created from the result of reading speed of monolingual display, and the expected reading time of the language switching display was compared with the reading time of bilingual superimposed display.
As the comparison result, it was found that the reading speed of the bilingual superimposed display is significantly faster (p＜0.01).