Smart devices applications can assist children in improving their learning capabilities and comprehension skills. However most applications are built without taking into consideration the effective needs and background of Arab children and youth. They are somehow incompatible with their local environment. We propose in this paper an Arabic-based mobile educational system that displays illustrations automatically to characterize Arabic stories' contents. In order to generate these illustrations, different phases are carried out which include processing of Arabic texts, extraction of word-to-word relationships, building and accessing an educational ontology and usage of Internet search engines. The aim of our system is to improve the Arab children educational skills to grasp Arabic vocabulary and grammar using multimedia with a portable smart device which includes observation, comprehension, realization, and deduction. Children will then be able to continue learning outside the limited time of their schools and from any location with enabled Wi-Fi connectivity. Preliminary results show that the system enhances the learners' comprehension, deduction and realization.